Process West Intake Manifold Street Version Subaru STI 2004-2021 | PWIM002 FocusRS_2016-2018 The Go Fast Bits Response

The Go Fast Bits Response blow-off/bypass valve system for 02-07 WRX and STI is much more than simply a noise maker or a factory valve replacement

An advanced twin piston shock design separates the ER series from rest of the pack

Part #: HB178F

Part #: SU334

Engineered to provide the highest degree of protection and improvement of differential efficiency for better mileage

Process West Intake Manifold Street Version Subaru STI 2004-2021 | PWIM002 FocusRS_2016-2018 The Go Fast Bits ResponseProduct Fitment: 2004 2021 Subaru STI The Process West Billet Intake Manifold range represents the pinnacle of design, engineering, and performance for Subaru WRX and STI platforms. Born from years of R&D, extensive testing, and countless prototype iterations, this manifold is the result of a no compromise approach to performance and aesthetics. Crafted for both street and race applications, the manifold is available in multiple configurations to suit