Been reading through the forums to try and find an intercooler core size that will fit behind the grill on the KZJ71/78. What have others gone with? I'd like to keep the AC. I assume I'll have to cut a couple of holes in the body behind the grill? Also, I've seen folks go with 2" pipe from the turbo to the intercooler and 2.5" from the intercooler to the intake.