i have the Macht Schnell x pipe with the OEM mod (not sure of the version) but it sounds great at WOT and low at cruising speed (while on flat surfaces). Its more of a deep sound at cruising speeds but once it revs up it becomes intense and high pitched. All my friends love it but if you're older and want to keep a low profile at times it may not be for you (maybe a valved system would be better).
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