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      01-16-2013, 04:52 PM   #2
cssnms
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Drives: 2011 BMW 335d
Join Date: Sep 2010
Location: Murland

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It will not throw codes so long as all of your cats and sensors are left in place. As for the improvement in sound, do not get your hopes up. The improvement is negligible. That said, installing a larger diameter mandrel bent center pipe (cat back) and a high flow muffler I expect you will pick up a couple more ponies.