GFB Whistling Trumpet (only for Stealth FX and WRX Hybrid) - 5701 Techna-Fit 0 FA20F STI 15-21 Subaru

SKU: 28421791594

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GFB Whistling Trumpet (only for Stealth FX and WRX Hybrid) - 5701 Techna-Fit 0 FA20F STI 15-21 SubaruThe 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. The ability to change the sound of a blow off valve is increasingly becoming an important issue with buyers, who want

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