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      09-07-2012, 11:22 AM   #51
Rotorocious
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Drives: 335xi
Join Date: May 2010
Location: Colorado

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Interesting. I've tested the car with open downpipes and didn't get a similar result.
A tune is definitely needed.

Not to nitpick but wouldn't run 4 usually be the before run and 6 the after exhaust run?
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