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Fitment guide

Best Mods for the Subaru WRX/STI

The WRX/STI formula is boost, all-wheel drive and that boxer rumble. Reliability lives and dies by the supporting mods, so tuning has to go hand in hand with fuelling, cooling and a clutch that can cope. Skip the support and the engine reminds you why.

Engine
EJ20 turbo · EJ20
Drivetrain
AWD
Power (stock)
268-310 hp
Wheel bolt pattern
5x114.3
Chassis
GD/GR/VA
Years
1992-present
Where to start

Get the tune done properly with cooling and fuel sorted, not in isolation. A stronger clutch and a proper intercooler are what turn a peaky STI into a dependable one.

What fits the Subaru WRX/STI

85 real parts across 14 categories, pulled from the Carmodfinder dataset. Counts are what actually fits this platform.

Engine Management

3 that fit
01Cobb Tuning AccessportECU flash+40-70 hp
02Cobb ECU flash / remapECU flash+40-70 hp
03EcuTek ECU flash / remapECU flash+40-70 hp

Forced Induction

4 that fit
01Garrett GTX bolt-onTurbo upgrade+120-270 hp
02Blitz Blow-off / diverter valveDiverter/BOV
03Tial Blow-off / diverter valveDiverter/BOV
04HKS Blow-off / diverter valveDiverter/BOV

Intake & Fuel

3 that fit
01Cobb Tuning SF intakeIntake+6-15 hp
02Cobb Cold air intakeIntake+6-15 hp
03K&N Cold air intakeIntake+6-15 hp

Exhaust

6 that fit
01GrimmSpeed Catted downpipeDownpipe+15-35 hp
02ETS High-flow downpipeDownpipe+15-35 hp
03Invidia High-flow downpipeDownpipe+15-35 hp
04Invidia Q300Cat-back+6-15 hp
05HKS Cat-back systemCat-back+6-15 hp
06Tomei Cat-back systemCat-back+6-15 hp

Suspension

6 that fit
01Whiteline Adjustable sway barsSway bars
02BC Racing Coilover kitCoilover
03Tein Coilover kitCoilover
04Ohlins Coilover kitCoilover
05Cusco Anti-roll bar setSway bars
06Hardrace Anti-roll bar setSway bars

Wheels & Tyres

6 that fit
01Rays Volk TE37 / Gram LightsForged wheel
02H&R Wheel spacers (hubcentric)Spacers
03Project Kics Hub-centric wheel spacersSpacers
04Work Aftermarket alloy wheelsForged wheel
05Rays Volk Racing Aftermarket alloy wheelsForged wheel
06Whiteline Hub-centric wheel spacersSpacers

Brakes

12 that fit
01StopTech Big Brake KitBBK
02EBC / Endless Performance padsPads
03Goodridge Braided brake linesLines
04HEL Performance Braided brake linesLines
05Project Mu Performance brake discsDiscs
06Wilwood Big brake kitBBK
See all 12 brakes options that fit →

Drivetrain

8 that fit
01ACT HD/Race clutchClutch
02Competition Clutch Performance clutchClutch
03Fidanza Lightweight flywheelFlywheel
04South Bend Clutch Performance clutchClutch
05Competition Clutch Lightweight flywheelFlywheel
06Exedy Lightweight flywheelFlywheel
See all 8 drivetrain options that fit →

Cooling

6 that fit
01GrimmSpeed Top-mount ICIntercooler
02Mishimoto Oil catch canCatch can
03Radium Engineering Oil catch canCatch can
04GReddy Oil catch canCatch can
05HKS Performance intercoolerIntercooler
06Mishimoto Performance intercoolerIntercooler

Chassis & Bracing

6 that fit
01Cusco / Ultra Racing Front strut braceStrut brace
02Cusco Strut/chassis braceStrut brace
03SuperPro Poly bushing setBushings
04Whiteline Poly bushing setBushings
05Hardrace Poly bushing setBushings
06Ultra Racing Strut/chassis braceStrut brace

Engine & Internals

1 that fit
01IAG Stage 2.5 blockShort block

Aero & Exterior

11 that fit
01Chargespeed Front lipFront lip/splitter
02APR Performance GTC-300 wingRear wing
03Varis Wide-body kitWidebody
04Chargespeed Side skirtsSide skirts
05- Hood scoop / ventsBonnet scoop
06VIS Racing Vented bonnet / hoodBonnet scoop
See all 11 aero & exterior options that fit →

Interior

7 that fit
01Bride / Recaro Bucket seat + railsSeats
02Momo / Nardi Steering wheel + bossSteering wheel
03- Short shifterShifter
04Bride Bucket seatSeats
05Recaro Bucket seatSeats
06Nardi Steering wheelSteering wheel
See all 7 interior options that fit →

Lighting & Styling

2 that fit
01- Window tintTint
02- Vinyl wrap / resprayWrap

Where the law bites

Fitment is one question, road-legality is another. These depend on where you drive.

Check the WRX/STI build in the garage

More car mod guides

Understand the parts

Parts and fitment shown for the Subaru WRX/STI come from the Carmodfinder dataset and are a starting point, not a guarantee for your exact trim, year or market. Always confirm fitment and road-legality for your specific car before buying.