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      04-25-2012, 12:22 PM   #40
RobMCoupe
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Drives: 2007 Z4 M Coupe
Join Date: Feb 2010
Location: Bay Area

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I did not need a smog test last year. This was my main concern before the mod. My shop said they done several M3s passing smog was no problem. Just make sure the car is hot before pulling in for the test. They also suggest leaving the headers as is without coating. It will be easier to pass visual inspection. Our cars are so low they can't really see the O2 relocation.
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