Process West Intake Manifold Cable Throttle Stock Orientation (suits Subaru 99-00 WRX/STI) - BlackFull Billet Aluminium Plenum with Billet Bell Mouth ended Runners CNC mandrel bent tube components Compatible with Factory AC. The Process West range billet manifolds is a no holds barred manifestation of what is possible under the hood of a WRX STI when perfect aesthetics meet high end performance. What you see here is the result of years of research and testing, multiple prototypes and a ground up fully featured design process that makes this a key