Switch to dual straight pipes

[JimmyDw8xb]

I have a 2007 KW T600 areocab with a single exhaust with muffler that exits behind sleeper. My question tonight is about exhaust. My fault codes that show on my Keep Trucking ELD are always the same. Something about EGR cooler (which is unplugged) and excessive exhaust pressure. I want to change the single exhaust with a muffler, to dual 6 inch straight pipes that exit behind sleeper. Is that a wise move? And will that cause the computer to need changes?