1) not noticeably, I wouldn't bother taking it apart and cleaning it unless its coming off anyways.
2) VERY nice gains with the M370, after a dyno tune. Didn't notice much till I got to the tuner to be re-dyno'd, but it really ripped after! I've attached a dyno chart comparing before (just cat back) and after (ART pipes and M370 installed) both times tuned with uprev
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