What Bolt On Mods Make Power!?!? E90 M3
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01-22-2013, 09:24 AM
Drives: 15 F80 MG/SO 6MT
Join Date: Jul 2012
Sorry to bump an old thread but there is something I can't seem to pinpoint.
Are the HP gains much more with Primary Cat delete than they are with an x-pipe with High Flow cats? Lets say test pipes vs a challenge sport with high flows.
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