Subaru Impreza WRX STI GD Performance Parts & Upgrades

• Subaru Impreza WRX (GD): the non-STI WRX of the same era
• Subaru Impreza WRX STI (GC)
• Subaru Impreza WRX STI (GR)
• Subaru Impreza WRX STI (GV)
• Subaru WRX STI (VA)
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• Intake and turbo: COBB and Process West intakes and intercoolers, Perrin turbo inlets, and GFB and Turbosmart blow-off valves.
• Exhaust: KORSH downpipes, Tomei exhaust manifolds, COBB and GrimmSpeed up pipes, and COBB, Borla, Fujitsubo and Tomei cat-backs.
• Engine: CP, JE and Mahle pistons, Manley rods, ACL bearings, ARP fasteners, Cometic head gaskets, GSC, Ferrea and Supertech valvetrain parts and a Torque Solution oil pickup.
• Drivetrain and shifting: COBB, Perrin and GrimmSpeed shifters and shift parts, a Perrin diff lockdown, and Drive Shaft Shop driveshafts and axles.
• Suspension and brakes: HARDRACE bushings and arms, Perrin end links and braces, AST coilovers, Alcon, AP Racing, Brembo and Paragon big brake kits and Frenkit caliper rebuild kits.
• Cooling: COBB CSF and KOYORAD radiators and Mishimoto oil coolers.

• 2.0L or 2.5L: imports and early Australian cars have the EJ20, later Australian cars the EJ25. Engine parts are listed for one or the other.
• Facelift years: the GD was facelifted twice. Process West intercoolers come in Bugeye and Blobeye versions, so check the title against your car.
• Wheel studs and spacers: early GD STIs use a 5x100 stud pattern and later ones 5x114.3. Check your hubs before ordering.

Have a qualified workshop fit suspension, brake, drivetrain and engine parts. Get a wheel alignment after any suspension change, and bleed and road-test the brakes after brake work. Intake, turbo, fuel and exhaust upgrades need a tune to match.