If the egr system is completely removed... in other words... a performance manifold WITH OUT EGR provision is installed, what will that do to an engine... I don't need to pass emissions, and mileage is SEMI-important, ... will it change mileage at all??

 

You stand to lose both power and fuel economy from retarded timing. Got to GMTech's site and check out his Tech Article, or the one right here at TGO submitted by him.

 

from what I understand it will make it run a little hotter to