You do have to trim your grill at the bottom
Easy though, just cut out small notches where it attatches to the chassis (you'll see, its obvious)
If you have a V8 you might have to relocate your oil cooler upwards about 2"
Again, very simple.
Just drill a couple of new holes and move it up a bit
You can (just) see the small cut outs at the bottom of my grill
:D