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      05-14-2009, 03:12 PM   #2
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Drives: 2011 M3 COUPE
Join Date: May 2008
Location: NEW YORK

Posts: 6,012
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secondary cat delete was done on OEM system. No codes are produced by this since both O2's are on primary. I left the resonators in place to eliminate overly raspy sound and there is no added drone by this mod.
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