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Thanks for everyone's replies so far - I really appreciate it. I have MANY threads on the ACM OEM Exhaust Mod but I started this thread asking E93 owners because I figured the sound insulation was slightly different between our cars and E90/E92.
Any other E93 owners have any thoughts about in-cabin noise under 3,500 RPMs with the windows up (see my original post above)? Thanks for everyone's help!
Jeremy
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