6.0l 2500 with full all speed engineering exhaust. 1 7/8 long tubes, 3" o/r y pipe, and 3" catback exhaust. I used the stock clamps and need to change them as you can hear some exhaust leaks. Runs much better and sounds pretty good. Passenger side spark plugs are close with number 2 plug touching header so i wrapped for now. You do have to cut tab on transmission passenger side to fit header. Besides that all lines up perfect. Also installed cold air with exhaust.