Booster is not what you'll have to worry about, just a bigger bore m/c to move more fluid to the brakes according to another builder on here. Our trucks have a 15/16 bore, you can run a montero sport with 1" bore or 3000gt vr4 with 1 1/16" bore. I'm not that far yet but will most likely run the 1 1/16 as I am going to be running rear disc too later on. Merrill on the forums has a build thread going right now with a brake upgrade going on, think he is going to use 3000gt calipers also