The Dual Port BOV for the Mazdaspeed3 is four valves in one, it is able to be changed from the Supersonic, Megasonic, Plumb Back or Dual Port valves. 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.