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exhaust pre-resonator removal??
Not sure if I'm wording this right but my Z4m had after the cats pre-resonator or something like that. I had them cut out and it sounded much better and a tad more power. No affect on emissions as it didn't affect the cats.
Does the M6 also have this type setup? I'm gonna look myself when I get it back next week but any input would be appreciated.
TY!
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