Quote:
Originally Posted by HardcoreTuner
Anyone know the part number for the M muffler? My car has the M package but using BM3, I'm not convinced my car has valves on the muffler. I bought it used so won't be surprised if someone swapped the wrong part after a repair or something. High Flow cats didn't make nearly any change in sound. My x7 saw a huge improvement with same cats.
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I have this EXACT same question. Driving me nuts trying to figure out how to find out if I have the M sport muffler or not.