Stronger, more durable, adjustable and capable of withstanding much higher boost levels than the factory item, the new STi Dual Port is an ideal bolt-on performance replacement for anyone intending to increase the boost on their MY08 Impreza STi.

Featuring both the recirculating and vent-to-atmosphere ports, the Dual Ports offers the best of both worlds with quiet operation during normal driving and full flow benefits of an atmospheric BOV under full throttle.