Grimmspeed Bypass Valve BOVNote: Does not fit OEM TMIC. Aftermarket TMIC (Process West, Grimmspeed) required for fitment. The long awaited GrimmSpeed Bypass Valves are here! Our passion for building the most robust, best performing parts on the market has driven us to create the finest version of one of the hardest working parts of your vehicle's turbo system. Performance In testing of stock bypass valves, we saw repeated internal leakage at boost levels as low as 8psi in the
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