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The OP's question is a common one for those who swap exhausts. If you have a FULL exhaust system, including HFC's (or a cat delete), you cannot pass an emissions test. It's that simple. All these exhaust systems are labelled "off-road use only" for a reason - they fail EPA tests or were never presented for certification. Simply doing a visual on the car will cause an automatic fail. Just changing a muffler won't be a problem, but going over that will cause a "fail" on any test that is HONESTLY conducted. I agree the test is B.S., but if you live where they have one, you have no reason to complain about failing the test when you modded the car knowing full well it would, in fact, fail.
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2009 E92 M3 - Jerez Black/Black w/ black carbon leather interior, 6 spd., Cold, Premium, Technology, 19" OZ Racing wheels (black), iPod/USB. Mods: aPe air filter, Borla exhaust, H&R sport springs, UUC Evo3 SS w/ DSSR, Power Pulley Kit, carbon kidney grills, Vorsteiner front air dam, carbon side gills, smoked side markers
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