I just installed this in my 2008 Duramax cc/sb, and it looks awesome. 5" is extremely tight but I knew that it would be before purchasing this. I had to change my spare tire to a 245/75/16, instead of 265, and that gave me more clearance for the tail pipe section. If the box didn't come all beat up, and pipe sections distorted at the ends, I'd happily rate this a 5 star. Planning on getting a 7x36" stack to go on, to give it a little more bark. If I did it again, I'd go 4" back to dpf section (mine is deleted), then 5" on back, just for the plain fact that 5" is hard to maneuver around on the front end. Regardless, pipe is pipe at the end of day on a diesel.