Thread: downpipes
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      04-25-2014, 01:24 PM   #12
mitch808
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Drives: 2012 X5 35i
Join Date: Mar 2014
Location: Seattle

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I've run catless on various cars for a number of years, close to a decade now across a few cars. Normally if a car isn't "tuned," the fumes are pretty bad, otherwise a proper tune will lean out a normally factory rich tune. Of course exhaust leaks are a strong contributor to this too...
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