EGR, is it necessary?

EGR=Exhaust Gas Recirculator. It does exactly what the name implies. Under low vacuum eg. going down the highway, the little christer opens and allows raw exhaust gases (from the crossover) into the intake to supposedly reduce emissions. The problem is the little SOB get loaded with carbon and sticks open which can cause the engine to idle really ruff. I've blanked several without a problem. Now for the curve ball. Some newer engine manufactorers are using the EGR to also heat the intake which is something you'll need in the winter. :cussing: