I know this is purely anecdotal, and subject to change at any dealer, but.....
I have taken my truck in twice for warranty work on the A/C and other small inconveniences (like the rotating shift pattern on the 6-speed) and not had the first comment on warrranty and my aeroturbine exhaust. The service manager just tells me how good it sounds and asks the tech to rev it up when he drives by the desk. Hope it helps...