In other words; "EGR". Exhaust Gas Recirculation. The introduction of exhaust gases into the fuel/air mixture lowers the combustion temperature, hopefully to the point where Oxides of Nitrogen, one of the contaminates in smog, won't form.

That's what I thought.

This need to lower combustion temps for smog reasons is also why we are stuck with low compression engines, and low octane gasoline.

The last thing I want in ANY engine of mine is an incoming mixture contaminated with exhaust gas.

Thanks,
AV8TOR