Late-model European emission standards implemented restrictive gasoline particulate filters that heavily subdue the aggressive V8 soundtrack of the F90 M5. Swapping out the restrictive factory piping for high-flow Exhaust Downpipes drastically reduces turbo backpressure, speeding up spool times and delivering immediate throttle response. Elevate the acoustic profile of your super saloon with a premium GPF-Back Exhaust system. For dedicated track builds seeking maximum gas velocity and a deafening twin-turbo roar, GPF deletes remove the restrictive filter media entirely to unleash the true voice of the S63 engine.