The fog light brake ducts have been found to be pretty ineffective - which is why Mopar never produced the duct kit that was meant for the ACR with its fog-light delete.
I installed the duct kit made by Henry Cone and it is great. You wouldn't notice it was there. Here's the thread I posted way back when. Since then - I removed the grill insert on the top half of the grill and I painted the grill insert on the bottom half black.
http://www.viperalley.com/forum/anyt...more-pics.html
Now I think I'm going to put aftermarket fog lights in the fog light spots.