Re: Will axle backs and a cai void waranty if there is no tune?
Axlebacks are a worry-free issue. No way that will ever be grounds for voiding any powertrain warranty. I suppose if they were loud as hell and rattled stuff loose in your car, Ford might not replace some cosmetic things that were damaged...?
CAI is at your own risk. Shouldn't cause an issue, but since you are directly "tampering" with the engine, it's one of the mods listed on the checklist if there are any issues.
That said, I took my Mustang to the dealership last week to reflash the PCM, and they didn't say a second word about the CAI. They asked me if I had a chip in it and said it was good that I didn't since the reflash would screw it up, but when I told them I had a tuner to adjust for gears, they couldn't care less.
In fact, they were trying to sell me on letting their mechanic tune my Stang! If your dealership is Mustang-friendly, you'll be fine with any standard mods.
2011 Mustang 3.7L, 6A, MCA Pkg, Ingot Silver w/ Stone
Perf Mods: FRPP 3.73 Gears, 87 Octane Performance Tune from BAMA, Airaid CAI, Magnaflow Comp Axle-backs
Ext Mods: Lower chrome billet grille, Tint
Upcoming Mods: Lowering springs