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      11-25-2012, 09:31 AM   #7
mocohead
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Drives: '16 M235i 6MT & 12 128i Msport
Join Date: Sep 2010
Location: CA

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It sounds like you went into limp mode. There are a number of possibilities but you will need to have the dealer read the codes. Here's the rub - with your down pipe it is likely they will blame that for the limp mode (not an unrealistic explanation) and flag your car for warranty purposes. I wouldn't take it in unless it happens again. If it does, I would take the dp off and see if you can recreate the issue.

What octane gas are you running? Which brand of gas? What was the ambient temperature?