Doing an egr delete on my 02 gt which is need because install mac long tubes and it is capped off in the new headers. i want to just leave open or cap off at end of egr tube that plugs into stock exhaust manifold. Anybody has experience in this or deleting the egr? i want to look stock from top of engine so dont want to put a block on plate on it and pull all the vaccum lines off. i will have sct tuner by then so i can delete rear 02 sensors in prochamber and i believe you can turn the egr delete off too. also do i have to tune timing after removal of egr?