well me still being new to the gen III motors i had a few questions on a cam selection for future in my yukon xl. well mainly i want something that will pull good down low-mid rpm since this thing is a tank and i plan to pull a car trailer and maybe a camper with it so i dont want to be needing i big stall. like i know gen I motors they make rv cams 4x4 cams towing ect. mainly for low end a mid. just want a lil more umph outa the yukon im planing on doing lt headers no cats and custom true duals with thrush turbo mufflers i like the sound and there not too loud.