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      06-26-2011, 11:29 AM   #12
Drives: 328i, 335i, M3, 535i, X5, 36M
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Originally Posted by GTM_Challenge View Post
Our street X pipe showed gains across the entire power band actually, even with keeping the stock primary cats. It has been verified by some of our customers dynos as well.
so from what i understand, going with this option, id have no choice but to cut the oem pipe section behind the primary cats, and it wont trigger any issues?
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