Four BOVs in one. The Dual Port can be configured as a Supersonic, Megasonic, Plumb Back or Dual Port! Features sequential ports for quiet operation on mild boost and full performance at full boost. With a a Quick-release V-Band clamp, tool-free adjustment and all the parts needed for conversions included it is Turbosmart's most versatile BOV. SUPPLIED WITH: Blanking Plug, Extra Trumpet, V-band clamp, 38mm aluminium weld-on inlet adapter, Yellow Spring rated -22 to -20 InHg (installed).