GrimmSpeed V2 Bypass Valve - Red - 2004-2021 Subaru STI / 2002-2007 WRX PDM_brand-merchandise you are looking at the

you are looking at the Tomei Type R Poncam Camshafts

and lightweight GR5 titanium construction

or 06-08 Forester

Features the new Grip Dynamics system which improves grip for better handling and performance by focusing on key alignment and dynamic handling elements

GrimmSpeed V2 Bypass Valve - Red - 2004-2021 Subaru STI / 2002-2007 WRX PDM_brand-merchandise you are looking at theGrimmSpeed V2 Bypass Valve (Red) , 2004 2021 Subaru STI 2002 2007 WRX The GrimmSpeed V2 Bypass Valve in red for the 2004 2021 Subaru STI 2002 2007 WRX replaces the factory recirculating bypass valve with a performance unit that provides more consistent venting of boost pressure during throttle lift events. The factory bypass valve is adequate at stock boost levels but can become a limitation , or fail , as boost pressure increases with modifications.