GFB Whistling Trumpet Response/Deceptor Pro BOV

GFB Whistling Trumpet for GFB Response/Deceptor Pro BOV - Suits Low Boost

GFB has built a reputation on giving enthusiasts control over how their blow off valve sounds, and the Whistling Trumpet range is a direct result of that. The 5702 is a refined take on the original trumpet, engineered to deliver that signature whistle on setups that don't generate enough boost or RPM to trigger the standard part.

This listing covers the 5702 Whistling Trumpet, designed as a drop in replacement for the stock trumpet fitted to Respons and Deceptor Pro II valves. It produces the whistle more easily than the original 5701 trumpet and at a slightly higher pitch, making it better suited to lower boost applications where the 5701 struggles to sing.

Important: This trumpet is not compatible with the T9003 or T9503 valve types. For the whistle to work properly, the valve needs to be set so most or all air vents through the trumpet — Respons valves running 50/50 venting typically won't generate enough velocity to whistle.

Key Features

• Modified trumpet profile for low boost whistle response
• Slightly higher pitch than the original 5701 trumpet
• Direct replacement for the stock trumpet on compatible GFB valves
• Simple bolt on fitment, no modification required
• Excludes T9003 and T9503 valve types

Valve compatibility and fitment notes are provided in the tabs above. Please confirm your GFB valve model before ordering, as this trumpet is not suited to every GFB BOV type.

Not sure if this trumpet suits your build? Contact our team at sales@chicaneaustralia.com.au for expert advice.