I agree with BMARTIN03ZX3, I would cut the bumper as well. If you don't the bottom of the intercooler will be below the lower rad support, or very close. The other thing to mention is the plastic belly pan that goes from the bumper to the rad. support, if you don't recess it you won't be able to install that back. In my opinion that "directs" the flow through the intercooler not to mention the radiator!
Oh yeah it also places the inlet and outlet nicely so you can run the pipes through the rad support right next to the radiator and such... just my 2cents.
-John