As for the EGR; it stands for Exhaust Gas Recirculation. I have looked at this system over and over again, and I cannot find a single use it to be on an engine. On the flip side of the coin, the EGR hurts nothing remaining in place. In my mind it would appear to introduce unwanted hot air to the air fuel ratio, but I don't think it is enough to hurt anything.
...and Scotty is correct, it is illegal to remove any factory installed smog emissions on a street driven vehicle, despite their value or lack thereof. It is illegal to remove catalytic converters, yet millions of cars have had the cats removed.
Right now I am not a fan of regulated emissions. I am looking for an engine for my Dodge Ram due to clogged cats. There was no obvious warning sign at all that pointed towards the cats being clogged on my truck. No foul smell, no lights, and no noticeable lack of power.
I say there were no obvious signs because there were multiple warning signs that pointed to extreme back pressure in the engine. I blew a radiator, and after replacing that the bottom radiator hose blew off, running the engine hot before the temp guage could warn me (sensors designed to measure liquids do not read hot air and steam well). I buttoned that up and assumed the hose to be my fault. I checked everything over and nothing appeared to be damaged. The next weak link was the seam in the coolant overflow box. After that was repaired the water pump started to leak. I replaced every part of the cooling system without thinking about back pressure.
The next weak link in my cooling system was caused when the engine over heated. I had a head gasket blow. I could see air pumping via bubbles through the radiator. By that time it was too late. The heads on my truck are trashed, and the bottom end is destroyed due to coolant being introduced to the oil in mass quantities. To make things more interesting, the intake plenum was full of oil.
I know, that was a long post. I just felt like clearing up my negative opinion concerning emission systems. Plus it may give someone else a warning sign before they lose their own engine.
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