Actually the RPi GTC catback exhaust without the xpipe is pretty tame. i had on the RPi GTC catback till my breakin service then added the RPi cat delete/x pipes because it was too quiet.
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2012 M3 e92 LeMans Blue, RPi GTC full race system, RPi scoops, BMW performance decklid, GTS wheels, OEM gloss blk mirrors ...
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