More Subaru STI 2004-2007 parts:
All Subaru STI 2004-2007 parts | Brakes | Drivetrain | Engine | Tuning | Exterior | Intake | Interior | Suspension | Turbo | Cooling | Wheels | Fuel | Fluids | Wheel Accessories | WheelSpacers | Electronics
Shop exhaust systems for the Subaru WRX STI 2004–2007 (GD chassis). The GD STI runs the EJ257 2.5L turbocharged flat-four with a factory IHI turbocharger — a VF39 on 2004–2006 cars and a VF43 for 2007. You will find cat-back and axle-back systems, downpipes, headers, mufflers 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 exhaust systems fit my Subaru WRX STI 2004–2007 (GD chassis)?
Every exhaust system in this collection is fitment-tagged for the GD-chassis WRX STI (2004–2007) with the EJ257. The factory turbo hardware changed for 2007 (VF39 to VF43), so year can matter on turbo-adjacent exhaust parts — confirm your model year on the product page before ordering.
What is the difference between a cat-back and an axle-back exhaust?
An axle-back replaces only the rear muffler section and mostly changes the sound. A cat-back replaces the exhaust from the catalytic converter back, changing sound and usually freeing up flow as well. Most bolt-on systems install without cutting.
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, Tuning, Exterior, Intake and more are all linked above, and every one of them is scoped to the Subaru STI 2004-2007 only.