Sledge8

If the lobes were damaged shouldn't you have replaced the lifters?? I have played with a few LS motors and they really respond to a performance cam. The problem with a 2500 HD is you want to retain the low end torque so you have to stay on the lower end of a "Performance cam" They make plenty of smaller cams for trucks and once my warranty is up I just may do this as well. I think TSP sells 3 versions of VVT cams. They are really meant for Camaros with the 6.2 LS3 but can be put into a 6.0. With a 6000+ lb truck meant for towing I would be hesitant to go with their largest one. Stage 1 is probably what you want if you tow at all. With a tune, headers and mild cam I think you could pull 40 + hp from the 6.0. Ask TSP they will give you good advise. I am guessing you may have to swap valve springs for the higher lift of the cam.

Ahh, that would be a Flowmaster, Not a Magnaflow....

My old 04 2500Hd used to do this from time to time. I would guess 4-6 times in 12 years. I would shut the truck off and on restart the message would be gone and all worked as designed. Once in a while I would also get the heater come on when it was 90 outside. Same thing, shut it off and restart all good back to AC. Haven't seen either on the new truck yet... Damn Computers....

Blackbear and others can tune for 87, 89, 91, E85, etc. In each case they may add or subtract fuel and or timing in all areas of the rpm range to see the potential gains in performance. They also look at transmission tuning and Torque Management settings with the ecm and tcm to suit your needs. This kind of tuning is not snake oil and can lead to a big performance differences. I have heard from them that the L96 is on the high side for compression for them to tune with 87 so they recommend at least 89 for their tuning.