Deleted my 18 at 5000 km, efi live tune 4" exhaust full egr delete. Does 16/100 with 26' enclosed and 13/100 empty, left it at factory hp. Truck is much more responsive now and similar to my chipped 2005.
I run rock tamers on my duellys, but I filled in the center part with two more flaps. On my third set of tamers and 5th truck, never had the brushes but I like the tamers.