It looks like I'll be "Hot Rodding" my Duramax after all the good stuff I found on-line. Unfortunately I have the LLY 04.5 instead of the LB7 which has a programmer that boosts #'s up to 532 hp and 975 Ft-lbs. Thats awsome for just plugging in a box. The "HOT" box for the LLY only adds 180Hp and 360 ft-lbs. but it will be enough for me. Its like nitrous in a box! :Brow: So far PPE- http://www.pacificp.com/ seems to be the most involved and dedicated to the Duramax performance and upgrades. Right now I plan to get the HOTXcelerator and a ATS Co-pilot. One is for the engine, the other is for the trans which upgrades the shifts and reliability without having to pull the trans for a shift kit or other mods. PPE recommended it to me over pulling the trans. THey told me THe trans would be fine with the Co-pilot at the "HOT" box performance levels. I'm also adding the 4" exhaust but haven't found a definite winner but will be using a turbo-back over a cat-back style. I found lots of info on the Duramax surfing around the net and getting on a few turbo diesel forums. I feel that I'm not having the problems some have had but from what i've read and know, the programmers will solve and/or avoid me from running into them. I looked at "THe Edge", "Bull Dog", Hypertech, and Diablo; but felt PPE had the best product. Anyone else with comments or feedback?