Yes ford will know if its been chipped, no matter if its reflashed, wiped, reset once its done its forever saved in the computer i work at a ford dealer, ive seen a few stang owners get caught in a lie about tuners for warrenty claims
never install a chip on your car, you want to just update the tune via a hand held tuner.
yes it will void the warranty if not through ford., but ford offers performance packs for some vehicles that they update the tune on and it maintains the warranty, not the best performance but you keep the warranty.
__________________ 2003 Cobra Vert (Redfire) #3938 of 5082 @ 05/27/2003
472rwhp/493rwtq -Modification List - Dyno Sheet 2012 Mustang 3.7L M6 (Kona Blue) 2011 Ford Edge Sport (Red Metallic)