Originally posted by IL Sean:
Well exhaust gases will stay in the engine a little longer if there is back pressure, thus get reburned, those that were not already, that't my understanding. I believe it was Logan00 or ZetecRacing that explained it to me, and I might be wrong, it was a while ago. Again I never professed to know anything about anything.
Burning unburnt gas in the exhaust is already taken care of. It is called your EGR: Exhaust Gas Recirculation. It recirculates exhaust back into your intake to burn the unburnt gas to save a few miles per gallon. Thats what you were thinking of.
FYI: Its also one of the reasons our intake manifolds get so damn dirty.
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