According to www.turbosmart.com.au

"Megasonic
This Blow Off Valve is now the highest flowing in our range, out flowing most other makes, ideal for the serious racer. It also caters for the show cars that wish to stand out from the crowd. "



It was on our 2wd crystal blue sapph when we bought it, now running without d/v.

Hand adjustable from quiet to very loud.

Retails at approx. £250, yours for ... an offer I can't refuse.

PS: The bit of rubber has since been removed.