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      06-14-2009, 09:25 PM   #4
Vudoo4u2
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Drives: F10 M5
Join Date: Oct 2007
Location: It's bobsled time

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2011 BMW E90 M3  [5.00]
simple:

if you arent catless, run stage 2

if you ARE catless, run stage 3

even if you have exhaust and downpipes, but your exhaust has HFC's or your downpipes do...those count as a catalytic converter, so..stage 2
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