This blow-off valve is a direct replacement that requires no adapter for those of you who want to run high boost levels but still vents the BOV back to the air intake to maintain maximum driveability. 
6061 Aluminum construction
Precision CNC machined
Brass components
All Viton O-rings
Anodized for a bright and durable finish
Designed to run high-boost levels while venting the boost back into the intake