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On the M2C I think it makes it better but only slightly...maybe 10-15% better. I went in with higher expectations tbh and wish it was louder and deeper. The burbles are more burbly which I'm definitely not a fan of but I dislike the stock burbles so that will be the first thing tuned out when I decide to flash it.
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575RWHP F87 M2C - ECUTEK RACEROM with flex fuel tuning by Bend Calibration 1000+RWHP E46 M3, Lab22 Built Turbo S54, Bend Calibration Tuned - BMW Half Mile Record Holder
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