got a friend with an 07' 6.7 that just went out of warranty, just did a clutch on it as well. Never had a chip on it, bought with 10k miles on it. Has had 2-3 injectors put in it(warranty) has also had issues with the carbon build up, same reason was told to him, use jake brake. He's getting ready to do the dpf delete, says fuel mileage is horrible. I'll keep my 02', got 18 mpg on the other tank I ran at 9600lb vehicle weight. 50hp Diablo power puck is all that's on it....oh, and a straight pipe.