The Type 5 Dual Port BOV for the 2015 WRX features the innovative new Smart Port drive-by-wire friendly staging technology that gives you the response of a plumb-back valve, with the high performance benefits of a vent-to-atmosphere valve. The valve uses a quick release V-Band clamp to hold it to the flange and the valve configuration can be changed on the fly. It is best suited for medium size turbo cars in the range of 200-600hp. There is not another more versatile valve design on the market and is unique to Turbosmart. This is a direct bolt on and is ideal for someone who gets tired of BOV noises quick and likes to change things up often. Everything needed for install is included with valve.