Hi guys, I just bought a 03 F350 6.0 Dually Diesel Lariat, I was wanting to upgrade some of the parts on the truck to get some better performance for towing but I do not want to do anything that will void the 20k miles I have left on the warranty. The major work has been done to the truck before I bought it (EGR, Turbo, Heads), so I am not completely worried about the mechanics, but I know an exhaust brake voids the warranty, what about air intake, exhaust, computer programmers, etc, any help would be great.

an air intake (K&N and such) will not void the warranty. a power programmer will not as long as you reset to the stock setting before you take it in to get it worked on. i have both a K&N and hypertech power programmer on my truck and they didn't void anything.