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05-15-2020, 12:08 PM
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#3
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///M Powered for Life
Drives: E90M/E92M/M4GTS/M4GT4/M6/X5M
Join Date: Sep 2010
Location: Greenwich, CT
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If you hack up your oem xpipe and remove the secondary cats and resonators you will gain sound and still pass emissions like a boss
Other options require a tune to turn of CEL. Or other solutions like minicats etc but those don't seem really proven out to me
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