Whistling Trumpet

The GFB 5702 Whistling Trumpet is an aftermarket accessory for GFB blow-off and diverter valves, crafted from aluminum with a black finish. This component allows enthusiasts to customize the sound of their turbo system, providing a distinct whistling noise. Unlike its predecessor, the 5701, the 5702 is engineered to produce its characteristic whistle more readily, particularly in low boost applications where the 5701 might struggle. The 5702 also operates at a slightly higher pitch compared to the 5701. For optimal performance and sound, it is necessary to configure the valve so that all or most of the air vents through the trumpet. Note that Respons valves, when set to 50/50 venting, may not generate sufficient velocity to produce the whistling sound. This specific part is recommended for use with GFB Respons and Deceptor Pro II valves, with the exclusion of part numbers T9003 and T9503.