THE NEXT LEVEL OF BOOST CONTROL
Welcome to the most refined manual boost controller available on the market today. During development, we worked hand in hand with tuners across the country to develop this device and ensure that it solves legitimate problems that they have with other existing boost controllers. The GrimmSpeed MBC allows yo
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Good boost controller, holds well
Joshua · July 26, 2025
Missing hardware. Provided mounting brackets are wrong and misshapen