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The GFB whistling trumpet for Stealth FX and WRX Hybrid valves replaces the standard trumpet to alter the blow-off valve's sound. When most air vents through the trumpet it can produce a whistle; responsiveness depends on valve venting settings. This accessory gives owners a way to change valve tone while using existing GFB valve hardware when conditions allow sufficient airflow through the trumpet.
GFB Whistling Trumpet (only for Stealth FX and WRX Hybrid)
