The WRX Stealth FX blow-off valve is a 'bolt-on' fit for ALL Subaru WRX, STi, and ALL turbo Impreza variants manufactured during or after 2001 (models including and after the GDA, aka "bugeye").

It doesn't require any adaptors, extras or modifications - just remove the factory BOV and bolt it on!

Everything you need is supplied in the kit for quick and easy installation. Only the Stealth FX allows you to go from silent and unnoticeable to ear shattering in a matter of seconds!

It is a little known fact that the late-model WRX factory blow-off valve is actually designed to leak at boost pressures exceeding the factory level. Replacing it noticeably improves throttle response, and is definitely recommended in applications where the boost has been raised.