The GFB Whistling Trumpet is a black, high-boost replacement trumpet for GFB's Response and Deceptor Pro blow-off valves, specifically valve part numbers T9003 and T9503. It swaps in for the standard trumpet without extra tools or modification and turns the usual hiss into a sharp whistle under hard acceleration. For the whistle to work, the valve must be set to vent most or all of its air through the trumpet. Response valves set to a 50/50 vent split usually won't build enough air speed to whistle properly.
Features
- Black finish, made for GFB's Response and Deceptor Pro blow-off valves
- Gives a clear whistle under boost
- Replaces the standard trumpet directly
- Suits GFB valve part numbers T9003 and T9503
- No modification needed to fit
Specifications
- Brand: GFB
- Product Type: Whistling Trumpet (BOV Sound Accessory)
- Finish: Black
- Version: High boost
- Suits: GFB Response and Deceptor Pro BOVs
- Compatible Valves: T9003, T9503
- Setup Required: Most or all air vented through the trumpet
- Part Number: 5701
Vehicle Compatibility: Fits 2 parts from 1 brand. Select a brand to view.
GFB (2)
| Model | Variant | Engine | Years | Notes |
|---|---|---|---|---|
| Response BOV | Valves T9003 and T9503 | |||
| Deceptor Pro BOV | Valves T9003 and T9503 |
Please confirm fitment against your vehicle before ordering. Contact us if you need help selecting the right part.