KYOSTAR Resonated Equal Length MidPipe for 2014-2020 BMW F80 M3 F82 F83 M4 S55 3.0T The KYOSTAR Resonated Equal Length MidPipe is designed for BMW S55 3.0T Twin Turbo engines to improve exhaust flow efficiency, optimize exhaust pulse balance, and enhance overall exhaust performance. The equal length design helps reduce uneven exhaust pulse characteristics from the factory exhaust system, creating a smoother and more balanced exhaust note while improving turbocharged exhaust