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IGoFast1589 · 07-11-2011, 07:15 PM

It's unburned fuel detonating in the exhaust because the exhaust is so hot it causes it to ignite. They're not massive explosions because only a little unburned fuel gets there.

07-11-2011, 07:15 PM	#8
IGoFast1589 Captain 49 Rep 654 Posts Drives: 08 135i Join Date: Nov 2010 Location: NY iTrader: (2)	It's unburned fuel detonating in the exhaust because the exhaust is so hot it causes it to ignite. They're not massive explosions because only a little unburned fuel gets there.
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