for the newbies..
here is a cut/paste from one of the most knowledgeable people on this forum....LeFox
"to explain the concept.
original routing re-uses already burned gasses, which still have some unburned particles into the mixture and route them back to the inlet to burn again, thus actually burning the mixture twice.
this causes less unburned particles to be released into the air, which is better for the environment.
in this mixture, there are of course also exhaust fumes which don't burn that good and which prevents your engine from running optimal, especially at low rpm when there's not enough fresh air getting mixed with the already burnt mixture.
so, by re-routing this, you are no longer pushing fumes back into the engine, but filling it with a fresh air/fuel mixture, making your engine run smoother and healthier.
but, although minimal, this does affect the environment.
and, since you are no longer re-burning that air/fume/unburned particle mixture, you will be adding more fresh air/fuel mixture. Which will give you some minor changes in your gas/mileage. "
If you click on his Profile as well as mod Stevenc150, you'll find a plethora of knowlegde
