This is our third BMW and the sales people did not tell us it had an after market exhaust on it, among other things. It is noticeable at idle and on acceleration then quiet while normal cruising. No drone inside with the top up or down. I don't know what type it is nor how to find out. I do know I would like to swap out for a stock exhaust....even trade. Each paying he shipping. It is an '07 335i convertible, 53k miles. Any help with his would be nice, thanks in advance!
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