I have a 2010 gmc sierra 1500 crew cab. I am wanting to change my exhaust my wifes cousin recently bought the same truck except silverado. He recently put some pacesetter longtube headers with a y pipe to a borla muffler. I am thinking maybe the same except I was considering a x pipe and corsa muffler. I was wanting to cut out my cats but dont want my computer to be tripped. I know there has to be a certain amount of back pressure for things to function properly. so iv kinda rethought this alittle and thinking of leaving the cats in there. I was hoping someone had some views on the x pipe and if there would be enough back pressure for things to work.