Unquestionable enhancements to the overall chorus emitted through the Dinan system transcends all modes making the vehicle a delight to drive and enjoy. However, for those that wish to have options to limit the extraordinary soundtrack for late night or early morning arrivals/departures (or any number of other reasons) factory valve control is retained. This ensures the perfect blend of civility when not pushing the car or the full spectrum of auditory delight when in it. No matter the situation the Dinan valved axle back exhaust system is the answer for the discerning enthusiast looking for performance without sacrifice.