Whistling Trumpet The ability to change the sound of a blow-off valve is increasingly becoming an important issue with buyers, who want to sound different from everyone else. In 24, GFB released the Whistling Trumpet (part # GFB-571), which emitted a piercing screech when driving aggressively. Unfortunately for a number of GFB owners, the GFB-571 trumpet only worked with some valve types. For the owners of all other types of GFB valves, GFB have now released the GFB-572 – a modified version of the Whistling Trumpet that is designed to work on low boost applications where the GFB-571 doesn’t cut it. The GFB-572 can be used in place of the standard trumpet on all GFB valves, and will make the whistling sound more readily than the GFB-571 (high boost and RPM is required to get the whistle from a GFB-571), and at a slightly higher pitch. Like the GFB-571 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 5/5 venting. This part is recommended for Respons and Deceptor Pro II valves EXCLUDING GFB-T93 & GFB-T953

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