Torque Solution Aluminum Blow Off Valve Flange Tial Q & Q-R | TS-AL-TIAL CM and they will tell you

and they will tell you that the best bang for the buck handling mod you can give your WRX is a high-performance swaybar

The air filter is located in the original air box space and is protected by a heat shield which is designed to reduce intake air temperature and increase horsepower

Part #: BSR36Z

with increased strength and reliability

whether that system is factory or aftermarket

Torque Solution Aluminum Blow Off Valve Flange Tial Q & Q-R | TS-AL-TIAL CM and they will tell youPart #: TS AL TIAL Torque Solution Billet Tial 50mm Blow off Valve Weld on Flange ONLY. No Clamp or O ring. Features: Cnc machined 6061 T6 billet aluminum Direct Fitment Lifetime Warranty Made in USA This item is non application specific. Please verify compatibility before purchase. May require some modification for proper installation.