egr is just for emissions, so it wont effect driving. also, its only on when cruising, so its not even on during idle or wot.

only thing i can think of that may be affected is gas mileage, but that will still be minimal.

another option you could do would be delete it all together. get a couple block off plates for the exhaust and intake, and have the codes removed from the pcm. is your car stock?