More Subaru STI 2004-2007 parts:
All Subaru STI 2004-2007 parts | Brakes | Drivetrain | Engine | Exhaust | Exterior | Intake | Interior | Suspension | Turbo | Cooling | Wheels | Fuel | Fluids | Wheel Accessories | WheelSpacers | Electronics
Shop tuning and engine management parts for the Subaru WRX STI 2004–2007 (GD chassis). The GD STI runs the EJ257 2.5L turbocharged flat-four, and for 2007 its ECU was completely re-engineered for US LEV2 emissions. You will find engine management, ECU tuning and programmers here — every part in this collection is fitment-tagged for the 2004–2007 WRX STI, so check your year against the product fitment notes before ordering.
What tuning and engine management parts fit my Subaru WRX STI 2004–2007 (GD chassis)?
Every tuning part in this collection is fitment-tagged for the GD-chassis WRX STI (2004–2007) with the EJ257. The 2007 car is the split point — its ECU was completely re-engineered — so calibrations and engine management hardware should be matched to your exact model year and confirmed on the product page before ordering.
Does a 2007 STI need year-specific tuning?
Yes. The 2007 STI's ECU was completely re-engineered for US LEV2 emissions, and throttle and timing issues on those cars are noted in the model's history, so a calibration written for a 2004–2006 EJ257 car should not be assumed to suit a 2007 car. Choose engine management and maps listed for your exact year.
Where can I find other parts for my Subaru STI 2004-2007?
Start with the full Subaru STI 2004-2007 collection linked at the top of this page, or jump straight to a category — Brakes, Drivetrain, Engine, Exhaust, Exterior, Intake and more are all linked above, and every one of them is scoped to the Subaru STI 2004-2007 only.