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      12-16-2012, 05:31 PM   #6
sA x sKy
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Drives: AY/B M4 '15
Join Date: Apr 2010
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Originally Posted by jsmonet View Post
Just FYI, that's afterfire, otherwise known as little pockets of unburnt fuel igniting in the exhaust. Backfiring is a far more serious issue usually requiring, at the least, a new intake manifold after it happens

Overrun/afterfire is no big deal.
Your definition of afterfire is backfire...

Backfire happens when you run too rich and unburnt fuel ignites in the exhaust..its perfectly normal and fine if you're catless. Just have to be careful of the O2 sensors.
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