I have had my truck with the pup programed on the performance setting now for over 5k. It is great, no codes lots of performance, I lost about 1 mpg but I know that I drive it harder. EGT will go over 1050 (after turbo) so I keep a eye on it. I havn't tried it on the extreme setting because I know that I will want to leave it there, and the automatic transmission will not hold all the power. Do call Bully Dog and talk to Justin, their support is great and I am sure they will take care of your problem