BMW M3/M4 F8x Equal Length Valved ExhaustWelcome to the Valvetronic Designs catback exhaust system for the F8x platform, or in other words, the solution to the F8x sound problem. For years enthusiasts have been wanting to find a solution to the buzzy and raspy sound these cars produce from the factory. Since these cars were released back in the late portions of 2014 we all knew there was an amazing sound lying under all the rasp. Our mission has been to find this hidden sound and allow all
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