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      04-30-2009, 09:12 AM   #69
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Drives: 2011 M3 COUPE
Join Date: May 2008
Location: NEW YORK

Posts: 6,012
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no software is necessary for secondary cat delete since o2 senosors are only on primary cats. Make sure to leave the resonators and you will have no drone or rasp sound. just straight pipe is all that's necessary as replacement since resonators already exist farther back from factory.
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