KYOSTAR 89mm Valved Catback Exhaust System w/ Bracket for BMW S58 3.0T The KYOSTAR 89mm Valved Catback Exhaust System is engineered specifically for BMW S58-powered M models, featuring oversized 89mm mandrel-bent tubing to maximize exhaust flow and reduce backpressure. The integrated electronic valve system allows you to switch effortlessly between a refined daily driving sound and an aggressive performance exhaust note whenever desired. Constructed from premium T304
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