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E90/E92 M3 Exhaust Systems Overview
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04-15-2009, 02:58 PM
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E90///M3`
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2008 BMW E90 M3
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Originally Posted by
d_dot
so saying i would go with no cats at all which exhaust from the end of the headers all the way back will produce the most hp gains?
AFAIK, i believe RPi has the most gains. +24whp i believe? i could be wrong though.
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