Can somebody explain how this would affect performance and what is the right way of doing it. Some people say to take it off completely and use a block-off plate and some say just leave it there and just plug the hoses. Which one is true?

 

http://k2rd.freeservers.com/FC3S/PRO...SSIONS/egr.htm A good site, yes? Also if the diaphram in the egr is busted, it will cause a vacuum leak which causes.....irregular idle. Lesson: vacuum leaks can also be internal, so if you have a suspected vac leak, don't just look at the obvious. I had a bad diaphram on my 87na and put a screw in the output line FROM the solenoid to the egr valve. I did not care if the line that attaches to the egr or the nipple were left off. Didn't work anyway. Bought a new egr and I believe it cost around a hundred bucks plus. Forget. Another not so obvious potential for a vacuum leak on a turbo, is the air control valve, specificaly the switching diaphram inside the acv. At idle the switching solenoid routes a vacuum to the acv switching diaphram. If busted, as in brittle and broken due to the heat, then you have a vac leak just as disruptive as a vac hose left off a nipple.