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Go Fast Bits Blow off Valve Whistling Trumpet 5701
For High Boost (17psi and over), Suits Stealth FX, Deceptor Pro & Respons BOV
The 5701 can be used in place of the standard trumpet on GFB valves (Part numbers T9003 & T9503), and will make a whistling sound. However, it is necessary to run the valve so that all (or most) of the air vents through the trumpet – Respons valves will typically not generate the velocity required to whistle when set to 50/50 venting.
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No matter how hard I rev the throttle it still doesn't whistle just makes the standard whoosh noise