K&N Filter - Process West Cold Air Intake Kits Model_Forester 2003-2005 The Process West range billet

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

as used with Process West Cold Air Induction kits

Along with it's extreme temperature capabilities

After machining

K&N Filter - Process West Cold Air Intake Kits Model_Forester 2003-2005 The Process West range billetK&N are world renowned for their expertise in high performance air filtration. The filter technology and construction is second to none. Youll find a K&N filter in pretty much every activity that involves a high performance internal combustion engine, with the Subaru being no exception! This is a replacement K&N Filter, as used with Process West Cold Air Induction kits.