Started tunning my 07 LBZ CC Dually today, and noticed that a tune from my 2500 x-cab ran very diffrently on the big dually. It felt a bit more slugish. I guess weight is a big factor in tunning a diesel. I had to do all the adding a bit sooner. I will try to get a tune for a 3500 in the repository so you can see the difrence.![]()