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OP: I believe there has been a fair amount posted on this topic but to give you my experience: I previously had a 2008 E90 M3 w/DCT and a MS Power Pulley. No issues up to 19,800 miles when I sold the vehicle. Since the power is made higher up on the RPM's, I honestly couldn't feel the difference of the pulley alone but when combined with a filter and exhaust there was a small noticable difference. Hope this helped.
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