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All the BMW performance exhausts lean towards the quiet end of the spectrum. They try and have the system gain volume as the revs increase versus many of the louder aftermarket exhausts that are very loud at cold start and can drone. They are just focusing on a different demographic. I just drove with a client who had a dinan exhaust on his M3 and I almost thought it was stock. The E92 335 bmw performance exhaust sounds sweet but is nowhere near what other aftermarket systems sound like
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