Why waste your money????? I have a 2007 LBZ Duramax and it hauls my 2015 3735MK great so why do you want to upgrade??? if you want more power get a EFI Live tuner with a Idaho Rob tow tune and call it good and what else i did was to install a Hayden 2886 Severe heavy duty clutch fan and Transyn synthetic trans fluid and rock and roll IMO Do NOT get rid of your LBZ Duramax it is the best Duramax Ever made but if you do decide to sell your LBZ you will have no problem finding a buyer
