Turbo XS - Subaru 15-21 WRX - Recirculating Bypass Valve Type XS subaru-forester-2004 While some negative camber aids

While some negative camber aids in improving traction and road adhesion

Every flaw of the OEM header has been addressed and improvised during the development of the Tomei header

42% increase in coolant surface area (tubes)

corrosion-resistant springs

Turbo XS - Subaru 15-21 WRX - Recirculating Bypass Valve Type XS subaru-forester-2004 While some negative camber aidsThe Type XS Recirculating from TurboXS is the valve to get if you want an upgraded Bypass Valve but want to fully recirculate the vented boost back to your intake like the stock valve. Designed specifically using our all new "XS" BOV platform, this valve is designed as a direct replacement for the stock bypass valve and comes complete with everything you need to replace it. The XS platform adds incredible versatility to this Recirculating Bypass