The ficm is a must, also i would suggest rolling back the ecm/tcm. idk if bill can put an 07 all the way back to the tec3, but thats what i have and its great. After you have that done, the gryphon comes, which takes the truck from kitty to a lion. lol. Thats the order i would go in. I would also make sure you get the egt probe with the gryphon, definatly a must. Towing 12k you could probably go with a 65tow for sure, maybe even a 80lighttow. i tow a gross combo weight of 34-36k with a 65tow. hope this helps
