Forgive me, I am a newbee to the Duramax sceen. I have a 34 foot Motorhome on the back of a Kodiak 5500 chassis with the '05 Duramax. This is my first Chevy Diesel so I was wondering what the Chevy gods thought was the best performance mileage programmer / chip for heavy loads (26,000 GVWR without a trailer). I am probably stuck with stock 3.5" exhaust and not looking for an additional 150HP, just mild performance gains and maybe a little better mileage under load. The only programmer I have seen mentioned in my brief scan is the Edge. I have run the gammit with my Powerstroke trucks but this seems to be a new game according to my usual diesel place.