This is the Go Fast Bits Low Boost Blow Off Valve Whistling Trumpet Attachment for many Go Fast Bits Blow Off Valve. This attachment has been designed to change the sound of your blow-off valve by creating an aggressive whistle at low boost levels.
DETAILS:
Works with the Stealth FX, Decepter Pro, and TMS Respons blow-off valves
Produces an aggressive whistle
Works best when used under 12 psi of boost
NOTE:
This is for the attachment only and does not include the blow-off valve