# GFB Whistling Trumpet (only for Stealth FX and WRX Hybrid)

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.

## Details

- **Price:** 83.77 CAD
- **Vendor:** Go Fast Bits
- **Type:** Blow Off Valve Accessories

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 83.77 CAD | In stock |

---

> Source: [Standard Auto Part](https://www.standardautopart.com/products/gfb-whistling-trumpet-only-for-stealth-fx-and-wrx-hybrid)
> Updated: 2026-08-29