BMW Stock Exhaust Valve Controller - BMW S58 Engine Exterior Parts The carbon fiber construction not

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BMW Stock Exhaust Valve Controller - BMW S58 Engine Exterior Parts The carbon fiber construction notProduct Description Unlock the true voice of your BMW S58 engine with the BMW Stock Exhaust Valve Controller a precision built upgrade that allows full control of your exhaust valves for an uncompromised sound experience. From factory, BMWs valve system only opens the exhaust valves about 50%, even in Sport or Sport+ modes. With this controller, you can fully open the valves anytime, unleashing a deeper, more aggressive tone and giving your M car the