TurboWorks Blow Off Adapter Made of solid aluminum by CNC method. Allows for adaptation of Greddy-mount bleed valves to serial intercooler. Fits: Subaru Imperza WRX 02-07 Subaru STI GDB GDA EJ20 04-07 Hole diameter: 28mm. Bolt spacing: 105mm Dimensions shown in the last photo in the gallery. TurboWorks Blow Off Adapter Made of solid aluminum by CNC method. Allows for adaptation of bleed valves with Greddy type mount to a serial intercooler. Dimensions shown in the photo in the gallery. Suitable for: Subaru Imperza WRX 02-07 Subaru STI GDB GDA EJ20 04-07 Hole Diameter: 28mm.