Process West Subaru WRX & STI (VA/VB)

• Intercoolers: front mount kits for the WRX (VA) and STI (VA), Stage 1 and Stage 2 front mount kits and top mount intercooler kits for the WRX (VB), plus Verticooler and Khanacooler options.
• Intakes: 72mm and 76mm cold air intakes for the STI (VA), cold air intake for the WRX (VA) and a 72mm cold air intake for the WRX (VB/VN).
• Piping & hoses: charge pipe kits for the WRX (VA) and WRX (VB), intercooler piping kits, throttle adaptor pipes and Verticooler methanol injection hoses.
• Intake manifolds & TGV: DITTO and DITTO RACE manifolds for the WRX (VA) FA20DIT, intake manifold for the WRX (VB) FA24, and TGV delete kits.
• Dress-up & fitting kits: radiator covers for the WRX (VAG) / STI (VAB) and Verticooler/intake manifold fitting kits.

Subaru uses chassis codes to separate these generations. The 2014–2021 WRX is coded VA (VAG for WRX, VAB for STI) and runs the FA20DIT engine in WRX form or the EJ257 in STI form. The 2022-on WRX is coded VB (with VN used for some variants) and runs the FA24F engine.

Check the title of each product for the chassis code and engine family, and confirm it matches your vehicle's build. Some items are listed as compatible only with other Process West components, such as a PW intake manifold, Verticooler or specific intercooler stage, so read the bracketed notes in the title before ordering.

Most intercooler, intake and charge pipe fitments require removal of factory ducting and piping, and manifold or TGV work involves draining coolant and disturbing fuel and vacuum lines. Typical requirements include metric spanners and sockets, screwdrivers and hose clamp tools, torque wrench, new gaskets or seals where specified, and coolant where the system is opened.

Installation by a professional is recommended. Vehicles with modified induction or cooling hardware may also require ECU tuning by a qualified tuner, and any modification should be assessed against your state's vehicle standards and your insurer's requirements.

Will a VA part fit my VB WRX? No. The VA and VB are different platforms with different engines, so choose the part listed for your chassis code.

Do these parts need a tune? Manufacturers commonly recommend tuning after induction or intake manifold changes. Consult a qualified tuner for advice on your combination.

What is a Verticooler? It is a Process West intercooler design mounted vertically rather than in the standard top mount position; check the title for the chassis it is listed for.