BMW M2 Competition Equal Length Exhaust F87 S55Welcome to the Valvetronic Designs cat back 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 2018 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