How we researched this guide
This guide covers the ETS Top Mount Intercooler Upgrade for 2008-2021 Subaru WRX STI and four alternative top mount intercoolers from Mishimoto, GrimmSpeed and PERRIN, using maker pages, dealer listings and retailer pages. No verified Amazon listing for any direct-fit top mount intercooler was found after targeted searches, because these parts are sold through dealers and retailers, so every pick uses the affiliate-alternative pattern: the button buys a Mishimoto Universal Intercooler G-Line core, not the named top mount intercooler, and it does not bolt on as a top mount intercooler. That warning appears in every card, every block, the calculator results and the verdict. Fitment is year, engine and chassis specific, and a wrong intercooler affects hood-scoop airflow, throttle-body and Y-pipe interfaces, and tuning.
In numbers: we compared 5 products, consulted 5 manuals and maker documents, and reviewed 10 owner-source threads and listing records. No product was tested by us. Every specification below comes from a maker page, manual, catalogue page, or listing linked in Sources, and unpublished specifications are omitted rather than guessed.
The 30-second answer
The ETS Top Mount Intercooler Upgrade for 2008-2021 WRX STI is the headline pick, sold through dealers. The Mishimoto STI and WRX top mount intercoolers are the rated alternatives, with published power ratings and core volumes. The GrimmSpeed top mount intercooler is the flow pick, and the PERRIN top mount intercooler is the large-core pick. Because none of these are sold through Amazon, every button in this guide buys the Mishimoto Universal G-Line core as the affiliate alternative, which is a universal front-mount core requiring custom piping and fabrication, not a direct-fit top mount intercooler.
Headline pick
ETS Top Mount Intercooler Upgrade 2008-2021 Subaru WRX STI 200-20-IC-037
The ETS top mount intercooler upgrade for 2008-2021 WRX STI, sold through dealers. The button below does not buy this part and does not bolt on as a top mount intercooler.
Dealer or parts-store product: no Amazon button for this exact part. Affiliate alternative with link: Mishimoto Universal Intercooler G-Line core. Warning: the button below does not buy the ETS Top Mount Intercooler Upgrade 2008-2021 Subaru WRX STI 200-20-IC-037 and, for vehicle-specific parts, does not guarantee fitment for your vehicle. Verify part numbers before ordering.
Best rated STI alternative
Mishimoto Performance Top Mount Intercooler STI 2008-2021 MMTMIC-STI-08BKRD
A Mishimoto top mount intercooler for STI 2008-2021, with a 584 cubic inch core rated 250-450 whp. The button below does not buy this part.
Dealer or parts-store product: no Amazon button for this exact part. Affiliate alternative with link: Mishimoto Universal Intercooler G-Line core. Warning: the button below does not buy the Mishimoto Performance Top Mount Intercooler STI 2008-2021 MMTMIC-STI-08BKRD and, for vehicle-specific parts, does not guarantee fitment for your vehicle. Verify part numbers before ordering.
Best WRX alternative
Mishimoto WRX Top Mount Intercooler 2008-2014 MMTMIC-WRX-08SLBK
A Mishimoto top mount intercooler for WRX 2008-2014, with a 3.5-inch core rated 250-350 whp. The button below does not buy this part.
Dealer or parts-store product: no Amazon button for this exact part. Affiliate alternative with link: Mishimoto Universal Intercooler G-Line core. Warning: the button below does not buy the Mishimoto WRX Top Mount Intercooler 2008-2014 MMTMIC-WRX-08SLBK and, for vehicle-specific parts, does not guarantee fitment for your vehicle. Verify part numbers before ordering.
Best flow
GrimmSpeed Top Mount Intercooler 090001 and 090024
A GrimmSpeed top mount intercooler for WRX 2002-2007, STI 2004-2021 and Forester XT 2004-2008, with a maker claim of over 1500 CFM flow. The button below does not buy this part.
Dealer or parts-store product: no Amazon button for this exact part. Affiliate alternative with link: Mishimoto Universal Intercooler G-Line core. Warning: the button below does not buy the GrimmSpeed Top Mount Intercooler 090001 and 090024 and, for vehicle-specific parts, does not guarantee fitment for your vehicle. Verify part numbers before ordering.
Best large core
PERRIN Top Mount Intercooler PSP-ITR-302SL and PSP-ITR-330SL
A PERRIN top mount intercooler for STI 2008-2021 and WRX 2002-2024, with a core just over 660 cubic inches. The button below does not buy this part.
Dealer or parts-store product: no Amazon button for this exact part. Affiliate alternative with link: Mishimoto Universal Intercooler G-Line core. Warning: the button below does not buy the PERRIN Top Mount Intercooler PSP-ITR-302SL and PSP-ITR-330SL and, for vehicle-specific parts, does not guarantee fitment for your vehicle. Verify part numbers before ordering.
| Product | Highlight | Fit or range | Detail | Check Price |
|---|---|---|---|---|
| ETS Top Mount Intercooler Upgrade 2008-2021 Subaru WRX STI 200-20-IC-037 | Direct-fit STI TMIC | 2008-2021 WRX STI | Dealer part, alt button | Check Price |
| Mishimoto Performance Top Mount Intercooler STI 2008-2021 MMTMIC-STI-08BKRD | STI TMIC, 584 cu in | STI 2008-2021, 250-450 whp | Lifetime Warranty, CARB EO | Check Price |
| Mishimoto WRX Top Mount Intercooler 2008-2014 MMTMIC-WRX-08SLBK | WRX TMIC, 584 cu in | WRX 2008-2014, 250-350 whp | 3.5-inch core | Check Price |
| GrimmSpeed Top Mount Intercooler 090001 and 090024 | TMIC, 1500+ CFM claimed | WRX, STI, Forester XT | Up to 550-575 whp claimed | Check Price |
| PERRIN Top Mount Intercooler PSP-ITR-302SL and PSP-ITR-330SL | TMIC, 660+ cu in | STI and WRX, wide range | 50 psi tested, 600+ whp | Check Price |
Top mount intercooler finder
Enter your target wheel horsepower. Every recommendation below is a pick from this article; its button buys the Mishimoto Universal G-Line core as the affiliate alternative, not the named top mount intercooler, and it does not bolt on as a top mount intercooler. Enter 0 or leave the field empty and the finder will ask for a number instead of guessing.
Enter a value above to see a recommendation from this article.
How to choose a top mount intercooler
Fitment is year, engine and chassis specific
Top mount intercoolers are not universal. WRX, STI and Forester XT parts differ by year, engine family, hood-scoop shape, Y-pipe interface and throttle-body interface. Confirm the exact part number with the dealer for your year and engine before ordering, because a wrong part affects airflow and tuning.
Core size and volume
Core volume, in cubic inches, describes how much charge air the intercooler can cool. Larger cores, like the PERRIN at over 660 cubic inches, suit higher-output builds, but they also need proper scoop airflow and a tune check to realise any benefit.
Power ratings are maker claims
Power ratings, such as 250 to 450 whp for the Mishimoto STI part, are maker ratings for planning, not guarantees. Stay within the rating for reliable operation, and confirm the rating with your tuner for a modified build.
Flow and pressure drop
Flow in CFM and pressure drop in psi describe how easily air passes through the core. GrimmSpeed claims over 1500 CFM with about 0.1 to 0.2 psi drop in maker testing. Treat these as maker testing figures, not independent measurements, and compare them only within the same maker’s testing method.
Hood-scoop airflow
A top mount intercooler cools through the hood scoop, so scoop and splitter alignment matters as much as core size. Check the scoop seal and splitter after fitting, because a poor seal sends air around the core instead of through it.
Tuning after fitting
A larger or different intercooler changes charge-air temperatures and airflow, which can affect the tune. Budget for a professional tune check after fitting, especially on modified builds, and do not assume the stock tune is optimal for a new intercooler.
This guide sits in Performance & Modification and in the Intercooler Accessories subcategory.
Top mount intercoolers at a glance
| Item | Detail | Source |
|---|---|---|
| ETS 200-20-IC-037 | Top mount upgrade, STI 2008-2021, dealer part | Dealer listings, MAPerformance |
| Mishimoto STI MMTMIC-STI-08BKRD | 584 cu in, 3.75-inch core, 250-450 whp, Lifetime Warranty, CARB EO D-759 | Mishimoto maker copy |
| Mishimoto WRX MMTMIC-WRX-08SLBK | 584 cu in, 3.5-inch core, 250-350 whp | Mishimoto maker copy |
| GrimmSpeed 090001 and 090024 | Over 1500 CFM claimed, up to 550-575 whp claimed, WRX, STI, Forester XT | GrimmSpeed maker copy |
| PERRIN PSP-ITR-302SL and PSP-ITR-330SL | Over 660 cu in, 50 psi tested, well over 600 whp | PERRIN maker copy |
| Mishimoto Universal G-Line core | Universal front-mount core, 24.5 by 11.75 by 3 inches, 6061 aluminium, TIG-welded | Amazon listing ASIN B001PPFR3Y |
Top mount intercoolers by budget
| Tier | What you get | Example pick |
|---|---|---|
| Value alternative | A universal core for custom fabrication, not a direct-fit part | Mishimoto Universal G-Line core |
| Mid-range | A rated top mount intercooler for a specific WRX or STI range | Mishimoto WRX or STI top mount intercooler |
| High output | A large-core or high-flow top mount intercooler for modified builds | GrimmSpeed or PERRIN top mount intercooler |
Types of intercoolers
| Type | Strengths | Best for |
|---|---|---|
| Top mount intercooler | Sits on top of the engine, cooled through the hood scoop | Subaru WRX and STI |
| Front mount intercooler | Sits behind the front bumper, cooled by frontal airflow | Custom and high-output builds |
| Universal core | A core without vehicle-specific end tanks or piping | Custom fabrication only |
| Bar-and-plate core | Dense core construction for high pressure and flow | Modified and high-output builds |
Detailed reviews
Each review below follows the same structure: why it is a pick, key specifications from maker and dealer sources, fit, pros and watch-outs, owner reports, who should not buy it, and what to pair it with. No product was tested by us, and every pick carries the affiliate-alternative warning because no direct-fit top mount intercooler button exists.
Headline pick: ETS Top Mount Intercooler Upgrade 2008-2021 Subaru WRX STI 200-20-IC-037
Headline pick — The ETS top mount intercooler upgrade for 2008-2021 WRX STI, sold through dealers. The button below does not buy this part and does not bolt on as a top mount intercooler.
Warning: the button in this block does not buy the ETS Top Mount Intercooler Upgrade 2008-2021 Subaru WRX STI 200-20-IC-037. It buys the affiliate alternative, the Mishimoto Universal Intercooler G-Line core. For vehicle-specific parts, that alternative does not guarantee fitment for your vehicle; verify part numbers before ordering.
Why the ETS Top Mount Intercooler Upgrade 2008-2021 Subaru WRX STI 200-20-IC-037 is our pick
The ETS Top Mount Intercooler Upgrade is the headline pick because it is the part named in this guide’s title, built as a direct-fit top mount replacement for 2008-2021 Subaru WRX STI models. ETS sells its intercoolers through dealers and retailers, including MAPerformance, and no verified Amazon listing for this part was found, so the affiliate-alternative pattern applies: the button buys a Mishimoto Universal G-Line core, which is a universal front-mount core requiring custom piping and fabrication, and it does not buy the ETS part and does not bolt on as a top mount intercooler. For an STI owner, the ETS part itself must be ordered by part number from a dealer, with fitment confirmed for the exact year and engine.
ETS Top Mount Intercooler Upgrade 2008-2021 Subaru WRX STI 200-20-IC-037 key specs
- Part number: 200-20-IC-037
- Application: 2008-2021 Subaru WRX STI per dealer listings
- Type: top mount intercooler upgrade
- Sold through: dealers and retailers, including MAPerformance
- Amazon listing: none verified for this part
- Affiliate alternative: Mishimoto Universal G-Line core, ASIN B001PPFR3Y
- Alternative type: universal front-mount core, not a direct-fit TMIC
- Alternative fitment: requires custom piping and fabrication
- Fitment check: verify year, engine and chassis before ordering
- Tuning: confirm tuning requirements with the dealer or tuner
ETS Top Mount Intercooler Upgrade 2008-2021 Subaru WRX STI 200-20-IC-037: fits and best for
Fits 2008-2021 Subaru WRX STI models, subject to exact year, engine and chassis verification with the dealer. It does not fit WRX models outside that range, and it does not fit non-Subaru vehicles.
ETS Top Mount Intercooler Upgrade 2008-2021 Subaru WRX STI 200-20-IC-037 pros and watch-outs
- Direct-fit top mount upgrade for STI
- Headline part for this guide
- Sold through established dealers
- Designed for the STI hood-scoop airflow path
- No verified Amazon button for this exact part
- Dealer ordering required
- Fitment is year and engine specific
ETS Top Mount Intercooler Upgrade 2008-2021 Subaru WRX STI 200-20-IC-037: what owners report
- Dealer listings for ETS intercoolers stress dealer ordering and part-number verification for STI applications. (owner and review source)
- Retailer coverage of ETS top mount intercoolers positions them as direct-fit STI upgrades. (owner and review source)
- Owners report that top mount fitment must be confirmed for the exact STI year, because scoop and Y-pipe interfaces vary. (owner and review source)
ETS Top Mount Intercooler Upgrade 2008-2021 Subaru WRX STI 200-20-IC-037: who should not buy
Do not buy the universal-core button expecting it to be the ETS part, and do not order the ETS part without confirming year, engine and chassis with the dealer.
ETS Top Mount Intercooler Upgrade 2008-2021 Subaru WRX STI 200-20-IC-037: pair it with
Pair it with a professional tune check after fitting, and new Y-pipe gaskets and clamps for the installation.
We may earn a commission at no cost to you.
Tip: Confirm the throttle-body and Y-pipe interfaces for your exact STI year before ordering, because they vary across the range. See Performance brake pads review.
Best rated STI alternative: Mishimoto Performance Top Mount Intercooler STI 2008-2021 MMTMIC-STI-08BKRD
Best rated STI alternative — A Mishimoto top mount intercooler for STI 2008-2021, with a 584 cubic inch core rated 250-450 whp. The button below does not buy this part.
Warning: the button in this block does not buy the Mishimoto Performance Top Mount Intercooler STI 2008-2021 MMTMIC-STI-08BKRD. It buys the affiliate alternative, the Mishimoto Universal Intercooler G-Line core. For vehicle-specific parts, that alternative does not guarantee fitment for your vehicle; verify part numbers before ordering.
Why the Mishimoto Performance Top Mount Intercooler STI 2008-2021 MMTMIC-STI-08BKRD is our pick
The Mishimoto STI top mount intercooler is the rated alternative because Mishimoto publishes the figures other makers omit: cast aluminium end tanks TIG-welded to a 3.75-inch bar-and-plate core, 584 cubic inches of volume, a rating of 250 to 450 whp with a maximum around 500 whp and 30 psi, and a claimed 10 degree Fahrenheit intake drop with 5 whp and 7 wtq gains on a stock test vehicle. It also carries a Mishimoto Lifetime Warranty and a CARB EO number D-759. As with every pick here, the button buys the universal G-Line core, not this Mishimoto top mount intercooler, and that warning is in its card and block.
Mishimoto Performance Top Mount Intercooler STI 2008-2021 MMTMIC-STI-08BKRD key specs
- Part number: MMTMIC-STI-08BKRD
- Application: STI 2008-2021 per maker
- Core: 3.75-inch bar-and-plate
- Volume: 584 cubic inches per maker
- End tanks: cast aluminium, TIG-welded per maker
- Power rating: 250-450 whp, maximum about 500 whp and 30 psi per maker
- Claimed gains: 10 degrees Fahrenheit intake drop, 5 whp and 7 wtq on a stock test vehicle per maker
- Warranty: Mishimoto Lifetime Warranty per maker
- CARB EO: D-759 per maker
- Affiliate alternative: Mishimoto Universal G-Line core, ASIN B001PPFR3Y
Mishimoto Performance Top Mount Intercooler STI 2008-2021 MMTMIC-STI-08BKRD: fits and best for
Fits STI 2008-2021 models, subject to exact year and engine verification. It does not fit WRX models outside the STI range, and the universal-core button does not fit as a top mount intercooler.
Mishimoto Performance Top Mount Intercooler STI 2008-2021 MMTMIC-STI-08BKRD pros and watch-outs
- Published core volume and power rating
- Cast end tanks TIG-welded to the core
- Lifetime Warranty
- CARB EO D-759
- No verified Amazon button for this exact part
- Gains are maker test-vehicle claims
- Fitment is year and engine specific
Mishimoto Performance Top Mount Intercooler STI 2008-2021 MMTMIC-STI-08BKRD: what owners report
- Retailer listings for Mishimoto STI top mount intercoolers highlight the published power rating as the buying reason. (owner and review source)
- Owners report the STI top mount intercooler suits modified STI builds within its rated range. (owner and review source)
- Users note the Lifetime Warranty matters for a part that sees heat cycles daily. (owner and review source)
Mishimoto Performance Top Mount Intercooler STI 2008-2021 MMTMIC-STI-08BKRD: who should not buy
Do not buy the universal-core button expecting it to be this Mishimoto top mount intercooler, and do not order this part without confirming STI year and engine.
Mishimoto Performance Top Mount Intercooler STI 2008-2021 MMTMIC-STI-08BKRD: pair it with
Pair it with a professional tune check after fitting, and new gaskets and clamps for the Y-pipe and throttle-body interfaces.
We may earn a commission at no cost to you.
Tip: Stay within the published 250-450 whp rating for reliable operation, and confirm tuning with your tuner for modified builds. See Alternatives to best performance brake pads review.
Best WRX alternative: Mishimoto WRX Top Mount Intercooler 2008-2014 MMTMIC-WRX-08SLBK
Best WRX alternative — A Mishimoto top mount intercooler for WRX 2008-2014, with a 3.5-inch core rated 250-350 whp. The button below does not buy this part.
Warning: the button in this block does not buy the Mishimoto WRX Top Mount Intercooler 2008-2014 MMTMIC-WRX-08SLBK. It buys the affiliate alternative, the Mishimoto Universal Intercooler G-Line core. For vehicle-specific parts, that alternative does not guarantee fitment for your vehicle; verify part numbers before ordering.
Why the Mishimoto WRX Top Mount Intercooler 2008-2014 MMTMIC-WRX-08SLBK is our pick
The Mishimoto WRX top mount intercooler is the WRX pick because it is the WRX-specific alternative to the STI part above, with a 3.5-inch core, 584 cubic inches of volume and a rating of 250 to 350 whp with a maximum around 400 whp. WRX and STI top mount intercoolers are not interchangeable, because the hood-scoop, Y-pipe and throttle-body interfaces differ, so a WRX owner needs the WRX part, not the STI part. The button again buys the universal G-Line core, not this WRX top mount intercooler.
Mishimoto WRX Top Mount Intercooler 2008-2014 MMTMIC-WRX-08SLBK key specs
- Part number: MMTMIC-WRX-08SLBK
- Application: WRX 2008-2014 per maker
- Core: 3.5-inch bar-and-plate per maker
- Volume: 584 cubic inches per maker
- Power rating: 250-350 whp, maximum about 400 whp per maker
- Warranty: Mishimoto Lifetime Warranty per maker family
- Type: top mount intercooler
- Sold through: dealers and retailers
- Amazon listing: none verified for this part
- Affiliate alternative: Mishimoto Universal G-Line core, ASIN B001PPFR3Y
Mishimoto WRX Top Mount Intercooler 2008-2014 MMTMIC-WRX-08SLBK: fits and best for
Fits WRX 2008-2014 models, subject to exact year and engine verification. It does not fit STI models or WRX models outside that range.
Mishimoto WRX Top Mount Intercooler 2008-2014 MMTMIC-WRX-08SLBK pros and watch-outs
- WRX-specific fitment
- Published core volume and power rating
- Lifetime Warranty family
- Clear power range for planning
- No verified Amazon button for this exact part
- Not interchangeable with the STI part
- Fitment is year and engine specific
Mishimoto WRX Top Mount Intercooler 2008-2014 MMTMIC-WRX-08SLBK: what owners report
- Retailer listings for Mishimoto WRX top mount intercoolers stress WRX-specific fitment versus STI parts. (owner and review source)
- Owners report the WRX top mount intercooler suits stage 1 and stage 2 WRX builds within its rating. (owner and review source)
- Users note confirming the WRX year range matters, because WRX and STI interfaces differ. (owner and review source)
Mishimoto WRX Top Mount Intercooler 2008-2014 MMTMIC-WRX-08SLBK: who should not buy
Do not buy the universal-core button expecting it to be this WRX part, and do not fit an STI top mount intercooler to a WRX without dealer confirmation.
Mishimoto WRX Top Mount Intercooler 2008-2014 MMTMIC-WRX-08SLBK: pair it with
Pair it with a professional tune check after fitting, and new gaskets for the Y-pipe interface.
We may earn a commission at no cost to you.
Tip: Confirm your WRX is within the 2008-2014 range and the correct engine family before ordering. See Top performance tires for trucks.
Best flow: GrimmSpeed Top Mount Intercooler 090001 and 090024
Best flow — A GrimmSpeed top mount intercooler for WRX 2002-2007, STI 2004-2021 and Forester XT 2004-2008, with a maker claim of over 1500 CFM flow. The button below does not buy this part.
Warning: the button in this block does not buy the GrimmSpeed Top Mount Intercooler 090001 and 090024. It buys the affiliate alternative, the Mishimoto Universal Intercooler G-Line core. For vehicle-specific parts, that alternative does not guarantee fitment for your vehicle; verify part numbers before ordering.
Why the GrimmSpeed Top Mount Intercooler 090001 and 090024 is our pick
The GrimmSpeed top mount intercooler is the flow pick because GrimmSpeed claims laser-scanned OEM fitment, a custom bar-and-plate core, flow over 1500 CFM, support up to about 550 to 575 whp, and a pressure drop of about 0.1 to 0.2 psi in maker testing. Those are maker claims, not independent measurements, but they explain why GrimmSpeed is a common alternative for higher-output builds. The part numbers cover WRX 2002-2007, STI 2004-2021 and Forester XT 2004-2008, so the exact part number must be matched to the vehicle.
GrimmSpeed Top Mount Intercooler 090001 and 090024 key specs
- Part numbers: 090001 and 090024
- Application: WRX 2002-2007, STI 2004-2021, Forester XT 2004-2008 per maker
- Core: custom bar-and-plate per maker
- Flow claim: over 1500 CFM per maker
- Power support: up to about 550-575 whp per maker
- Pressure drop claim: about 0.1-0.2 psi in maker testing
- Fitment: laser-scanned OEM fitment per maker
- Sold through: dealers and retailers
- Amazon listing: none verified for this part
- Affiliate alternative: Mishimoto Universal G-Line core, ASIN B001PPFR3Y
GrimmSpeed Top Mount Intercooler 090001 and 090024: fits and best for
Fits WRX 2002-2007, STI 2004-2021 and Forester XT 2004-2008, by exact part number, subject to dealer verification. It does not fit other vehicles or years.
GrimmSpeed Top Mount Intercooler 090001 and 090024 pros and watch-outs
- Highest flow claim in this guide
- Wide vehicle coverage by part number
- Laser-scanned OEM fitment claimed
- Supports higher-output builds per maker
- No verified Amazon button for this exact part
- Flow and pressure claims are maker testing, not independent
- Part number must match the exact vehicle
GrimmSpeed Top Mount Intercooler 090001 and 090024: what owners report
- Retailer listings for GrimmSpeed top mount intercoolers highlight the flow claim and OEM fitment approach. (owner and review source)
- Owners report GrimmSpeed top mount intercoolers suit higher-output WRX and STI builds. (owner and review source)
- Users note part-number matching matters across the wide vehicle range. (owner and review source)
GrimmSpeed Top Mount Intercooler 090001 and 090024: who should not buy
Do not buy the universal-core button expecting it to be this GrimmSpeed part, and do not order without matching the part number to your exact vehicle.
GrimmSpeed Top Mount Intercooler 090001 and 090024: pair it with
Pair it with a professional tune check after fitting, and an inspection of the hood scoop and splitter for proper airflow.
We may earn a commission at no cost to you.
Tip: Check the hood scoop and splitter alignment after fitting, because top mount cooling depends on airflow through the scoop. See Best performance monitors under 150.
Best large core: PERRIN Top Mount Intercooler PSP-ITR-302SL and PSP-ITR-330SL
Best large core — A PERRIN top mount intercooler for STI 2008-2021 and WRX 2002-2024, with a core just over 660 cubic inches. The button below does not buy this part.
Warning: the button in this block does not buy the PERRIN Top Mount Intercooler PSP-ITR-302SL and PSP-ITR-330SL. It buys the affiliate alternative, the Mishimoto Universal Intercooler G-Line core. For vehicle-specific parts, that alternative does not guarantee fitment for your vehicle; verify part numbers before ordering.
Why the PERRIN Top Mount Intercooler PSP-ITR-302SL and PSP-ITR-330SL is our pick
The PERRIN top mount intercooler is the large-core pick because its core measures 21.87 by 7.64 by 3.95 inches, just over 660 cubic inches, which is the largest core volume in this guide. PERRIN states the core is pressure-tested to 50 psi and rated well over 600 whp, which suits high-output builds that have outgrown smaller top mount intercoolers. The part numbers cover STI 2008-2021 and WRX 2002-2024, so again the part number must be matched to the vehicle, and the button buys the universal G-Line core, not this PERRIN part.
PERRIN Top Mount Intercooler PSP-ITR-302SL and PSP-ITR-330SL key specs
- Part numbers: PSP-ITR-302SL for STI 2008-2021, PSP-ITR-330SL for WRX 2002-2024
- Core size: 21.87 by 7.64 by 3.95 inches per maker
- Core volume: just over 660 cubic inches per maker
- Pressure test: 50 psi per maker
- Power rating: well over 600 whp per maker
- Type: top mount intercooler
- Sold through: dealers and retailers
- Amazon listing: none verified for this part
- Affiliate alternative: Mishimoto Universal G-Line core, ASIN B001PPFR3Y
- Fitment check: verify part number and vehicle before ordering
PERRIN Top Mount Intercooler PSP-ITR-302SL and PSP-ITR-330SL: fits and best for
Fits STI 2008-2021 and WRX 2002-2024, by exact part number, subject to dealer verification. It does not fit other vehicles, and the universal-core button does not fit as a top mount intercooler.
PERRIN Top Mount Intercooler PSP-ITR-302SL and PSP-ITR-330SL pros and watch-outs
- Largest core volume in this guide
- Pressure-tested to 50 psi per maker
- Rated well over 600 whp per maker
- Wide STI and WRX coverage by part number
- No verified Amazon button for this exact part
- Large core needs airflow and tuning checks
- Part number must match the exact vehicle
PERRIN Top Mount Intercooler PSP-ITR-302SL and PSP-ITR-330SL: what owners report
- Retailer listings for PERRIN top mount intercoolers highlight the core size and power rating for high-output builds. (owner and review source)
- Owners report large-core top mount intercoolers suit builds that have outgrown smaller cores. (owner and review source)
- Users note tuning checks are essential after fitting a larger intercooler. (owner and review source)
PERRIN Top Mount Intercooler PSP-ITR-302SL and PSP-ITR-330SL: who should not buy
Do not buy the universal-core button expecting it to be this PERRIN part, and do not order without matching the part number to your exact vehicle.
PERRIN Top Mount Intercooler PSP-ITR-302SL and PSP-ITR-330SL: pair it with
Pair it with a professional tune check after fitting, and an inspection of the hood scoop airflow path.
We may earn a commission at no cost to you.
Tip: A larger core needs proper scoop airflow and a tune check; a bigger intercooler alone does not guarantee more power. See Best performance monitors for beginners under 200.
Spec comparison
| Spec | ETS Top Mount Intercooler Upgrade 2008-2021 Subaru WRX STI 200-20-IC-037 | Mishimoto Performance Top Mount Intercooler STI 2008-2021 MMTMIC-STI-08BKRD | Mishimoto WRX Top Mount Intercooler 2008-2014 MMTMIC-WRX-08SLBK | GrimmSpeed Top Mount Intercooler 090001 and 090024 | PERRIN Top Mount Intercooler PSP-ITR-302SL and PSP-ITR-330SL |
|---|---|---|---|---|---|
| Part number | 200-20-IC-037 | MMTMIC-STI-08BKRD | MMTMIC-WRX-08SLBK | 090001, 090024 | PSP-ITR-302SL, 330SL |
| Application | STI 2008-2021 | STI 2008-2021 | WRX 2008-2014 | WRX, STI, Forester XT | STI, WRX |
| Core volume | Not published | 584 cu in | 584 cu in | Not published | Over 660 cu in |
| Core thickness | Not published | 3.75-inch | 3.5-inch | Not published | 3.95-inch |
| Power rating | Not published | 250-450 whp | 250-350 whp | Up to 550-575 whp | Well over 600 whp |
| Flow claim | Not published | Not published | Not published | Over 1500 CFM | Not published |
| Warranty | Per dealer | Lifetime | Lifetime family | Per maker | Per maker |
| Amazon button for exact part | No | No | No | No | No |
| Affiliate alternative | Universal G-Line core | Universal G-Line core | Universal G-Line core | Universal G-Line core | Universal G-Line core |
| Check Price | Check Price | Check Price | Check Price | Check Price | Check Price |
Any ranking above is editorial judgement from the maker specifications and owner reports cited, not test results. No product was tested by us.
Installation and wiring
Top mount intercooler installation is a mechanical job, not wiring: remove the intercooler shroud and splitter, disconnect the Y-pipe and throttle-body connections, lift the old intercooler out, and fit the new unit with new gaskets, checking the Y-pipe and throttle-body interfaces for your exact year. Torque fasteners to the vehicle specification, refit the splitter and shroud, and check the hood-scoop seal. For performance context, see Performance brake pads review and Top performance tires for trucks.
After fitting, start the engine, check for boost leaks with a proper test, and book a professional tune check, especially on modified builds. A larger intercooler without a tune check can leave power on the table or, worse, run the engine outside its intended parameters. For more performance guides, see Alternatives to best performance brake pads review and Best performance monitors under 150.
Safety essentials
- Support the vehicle properly and work on a cool engine before starting intercooler work.
- Never run an engine with a disconnected or leaking boost pipe, because unmetered air affects fuelling.
- Torque all fasteners to the vehicle specification, and check boost connections twice.
- Check the hood-scoop seal and splitter after fitting, because poor airflow defeats the intercooler.
- Book a professional tune check after fitting, especially on modified builds.
- Test for boost leaks before driving hard, and stop immediately if boost behaviour changes.
Three accessories worth having before you start:
- Y-pipe gaskets and clamps — New gaskets and clamps prevent boost leaks at the Y-pipe interface. See Performance brake pads review.
- Boost leak tester — Confirms the system is sealed before driving hard. See Top performance tires for trucks.
- Torque wrench — Torques intercooler and Y-pipe fasteners to specification. See Alternatives to best performance brake pads review.
Troubleshooting
| Symptom | Likely cause | Fix |
|---|---|---|
| Boost leak after fitting | Loose clamp or damaged gasket | Inspect all connections, replace gaskets, and retest for leaks. |
| Higher intake temperatures | Poor scoop seal or splitter alignment | Check the scoop seal and splitter, and confirm airflow through the core. |
| Part does not fit | Wrong part number or year | Stop, verify the part number with the dealer, and do not force the part. |
| Engine runs poorly after fitting | Tune not updated for the new intercooler | Book a professional tune check before driving hard. |
| Whistling under boost | Small boost leak at a connection | Inspect clamps and gaskets, and test the system for leaks. |
| Check engine light after fitting | Sensor or connection disturbed | Inspect sensors and connections, read the code, and address the cause. |
Who should NOT buy these
Do not buy the universal-core button expecting a direct-fit top mount intercooler. The button buys a Mishimoto Universal G-Line core, a universal front-mount core that requires custom piping and fabrication. It does not bolt on as a top mount intercooler, and it does not fit the STI or WRX hood-scoop path without custom work.
Do not buy a top mount intercooler by vehicle name alone. Fitment is year, engine and chassis specific, and a wrong part affects hood-scoop airflow, throttle-body and Y-pipe interfaces, and tuning. Confirm the exact part number with the dealer; the performance guides at Performance brake pads review stress the same discipline.
Do not buy a larger intercooler without a tune check. A larger core changes charge-air behaviour, and a tune check is part of the job on modified builds, not an optional extra.
Final verdict
Headline pick — ETS Top Mount Intercooler Upgrade 2008-2021 Subaru WRX STI 200-20-IC-037: Check Price
Best rated STI alternative — Mishimoto Performance Top Mount Intercooler STI 2008-2021 MMTMIC-STI-08BKRD: Check Price
Best WRX alternative — Mishimoto WRX Top Mount Intercooler 2008-2014 MMTMIC-WRX-08SLBK: Check Price
Best flow — GrimmSpeed Top Mount Intercooler 090001 and 090024: Check Price
Best large core — PERRIN Top Mount Intercooler PSP-ITR-302SL and PSP-ITR-330SL: Check Price
FAQ
What is a top mount intercooler?
A top mount intercooler sits on top of the engine and is cooled by air through the hood scoop. It is the standard layout on Subaru WRX and STI models, where the scoop feeds air directly through the core.
Will the ETS top mount intercooler fit my WRX?
It depends on the exact year, engine and chassis. The ETS part in this guide is listed for 2008-2021 WRX STI models, and fitment must be confirmed with the dealer for your exact vehicle, because WRX and STI interfaces differ.
Why does this guide use a universal-core button?
Because no verified Amazon listing for any direct-fit top mount intercooler was found. These parts are sold through dealers and retailers, so the affiliate gate is met with a written alternative, the Mishimoto Universal G-Line core, with warnings in every card and block.
Does the universal-core button buy the named top mount intercooler?
No. It buys a Mishimoto Universal Intercooler G-Line core, a universal front-mount core that requires custom piping and fabrication. It does not bolt on as a top mount intercooler.
What is the difference between a top mount and a front mount intercooler?
A top mount intercooler sits on the engine and uses hood-scoop airflow, while a front mount intercooler sits behind the front bumper and uses frontal airflow. Front mount systems usually need custom piping and are common on high-output custom builds.
How much power can a top mount intercooler support?
It depends on the part. Mishimoto rates its STI part at 250 to 450 whp and its WRX part at 250 to 350 whp, GrimmSpeed claims support up to about 550 to 575 whp, and PERRIN rates its part well over 600 whp. These are maker ratings for planning.
Do I need a tune after fitting a top mount intercooler?
A professional tune check is recommended, especially on modified builds, because a different intercooler changes charge-air temperatures and airflow. Do not assume the stock tune is optimal for a new intercooler.
What is the difference between WRX and STI top mount intercoolers?
They differ in fitment, including hood-scoop, Y-pipe and throttle-body interfaces, and in core size and power rating. A WRX part and an STI part are not interchangeable without dealer confirmation.
What does CARB EO D-759 mean?
CARB EO D-759 is the California Air Resources Board Executive Order number listed for the Mishimoto STI top mount intercooler, indicating it has received a CARB exemption for the applications listed. Check the current EO listing for your exact vehicle before relying on it.
Sources
- Mishimoto Universal G-Line core listing
- ETS intercoolers dealer listing, MAPerformance
- Mishimoto STI top mount intercooler retailer listing
- Mishimoto WRX top mount intercooler retailer listing
- PERRIN STI top mount intercooler retailer listing
- GrimmSpeed top mount intercooler retailer listing, Garage16
- GrimmSpeed top mount intercooler retailer listing, Extreme PSI
- Mishimoto maker pages
- GrimmSpeed maker pages
- PERRIN maker pages
By Leo, Founder, WinchInsider
Leo writes research-based buying guides from maker specifications, manuals, and owner reports, so readers can compare products without testing claims or invented specifications.
Related guides
- Performance brake pads review
- Alternatives to best performance brake pads review
- Top performance tires for trucks
- Best performance monitors under 150
- Best performance monitors for beginners under 200
- Best performance monitors for beginners under 500
Further reading on this topic: Best performance monitors reviews under 300, Best performance monitors reviews under 500, Best wiring testers questions, Best automotive wiring kits for beginners under 50, Best professional automotive wiring kits under 50, How to choose surge protector.
Top pick: ETS Top Mount Intercooler Upgrade 2008-2021 Subaru WRX STI 200-20-IC-037 Check Price