Chris, I say zero boost when you get it back because we will be putting it through it's paces once we fire it up. We also impose the "hard" break in method but like said above you have a VERY short time for things to wear in and seal. We usually give the car back with about 15-30 miles on it. During that time we do 3 oil changes and the motor sees around 15psi. The only reason why we want the customer to limit boost is because most people won't know what to listen for, watch with various sensors attached etcetera etcetera. Especially with an untuned car.