i had it disconnected on my weber 34 running yj and never noticed any difference when i hooked it back up. i have to remove all the other lines still though, the little one from the cat area. its plugged but still hanging on.
that egr valve didn;t seem to do anything for me though so its your call
A cowardly leader is the most dangerous of men- Stephen King.
"Just because something isn't a lie does not mean that it isn't deceptive. A liar knows that he is a liar, but one who speaks mere portions of truth in order to deceive is a craftsman of destruction". --I am not sure who said this but it properly describes our president.