GFB 5701 Whistling Trumpet is designed for Stealth FX and WRX Hybrid valve applications. It replaces the standard trumpet on compatible GFB valves to create a sharper whistling blow-off sound...
GFB 5701 Whistling Trumpet is designed for Stealth FX and WRX Hybrid valve applications. It replaces the standard trumpet on compatible GFB valves to create a sharper whistling blow-off sound when the valve vents under boost.