Process West Subaru WRX / STI (GC8)

• Front mount intercooler kits – complete core and piping packages listed for the GC8 chassis.
• Top mount intercoolers – bonnet-scoop-fed cores for factory top mount layouts.
• Cold air intakes – enclosed intake kits to replace the factory airbox arrangement.
• Intake manifolds – billet manifolds offered in cable throttle stock and reverse orientation versions.
• TGV delete kits – billet tumble generator valve deletes, including 67mm sizing.

The GC8 chassis code covers the first-generation Subaru Impreza WRX and STI. Check the chassis code, build year and engine code (EJ20 or EJ25) shown on your compliance plate before ordering, as Process West lists some items by narrower windows such as MY99-00.

Intake manifold and TGV delete selection depends on whether your car runs a cable or drive-by-wire throttle, the manifold orientation you want, and the port size of your cylinder heads. Intercooler choice depends on whether you are retaining the factory top mount layout or converting to a front mount, and on the bonnet scoop and piping already fitted. Engine swaps and previously modified cars may need different parts to the original specification, so confirm what is currently fitted rather than assuming factory hardware.

Most items in this range require removal of factory induction components, and some need coolant or fuel system work, so installation by a qualified professional workshop is recommended. Typical requirements include metric spanners and sockets, hose clamp and screwdriver sets, new gaskets or seals where specified, and a torque wrench.

Intake manifold and TGV delete fitment can alter sensor locations and airflow, so an ECU tune by a qualified tuner may be required. Always refer to the manufacturer's supplied instructions, and check vehicle standards requirements in your state or territory before modifying an induction system on a registered vehicle.

Which cars does GC8 refer to? GC8 is the chassis code for the first-generation Subaru Impreza WRX and STI sedan.

Do I need a tune after fitting these parts? Intakes and manifolds can change airflow characteristics, so speak with a qualified tuner about whether a retune is needed for your combination.

Are intercooler kits sold complete? Some listings are complete kits with piping, while others are cores or individual components — check the product title and description for what is included.