Just picked up EFI live to tune my truck(04 duramax) and my buddies 04 SS. I am not quite sure where to get started. His truck has longtubes no cats and a magnaflow catback. We are looking to get the rear o2 sensors to shut off so it stops throwing the cat code, for it to make a bit more power and work on some tranny tuning. Does anyone happen to have a tune that would get us started in the right direction? Thanks.