Found this posted elsewhere. Thought some might find it interesting
Ford Warranty Coverage
Corporate Ford contact: Ryan Smith at (313) 322-1785 or email at rsmit291@ford.com.
Modifications must be compliance with warranty policy section 3-17. Ask your Ford dealer for a copy. This policy generally specifies that modifications must be in compliance with both State and Federal regulations. According to Ford "The installation/use of any non-Ford product will not necessarily void the Ford New Vehicle Limited Warranty. If, however, the non-Ford product fails or causes a Ford part to fail, the cost of the repair and any related damage are not covered by the Ford New Vehicle Limited Warranty." Ford also states that "The vehicle owner would need to look to the manufacturer or installer of the non-Ford product for repairs, not to Ford."
The new vehicle warranty does not cover damage caused by:
• Alteration or modification of the vehicle including body, chassis or components after the vehicle leaves Ford Motor Company's control. (Lift Kits, Oversized Tires, Roll Bars etc.)
• Misuse - such as driving over curbs, overloading, hauling in excess of G.V.W., racing or using the vehicle as a stationary power source.
• Tampering with emissions systems or with other parts that affect these systems. These would include power chips, exhaust and intake systems.
If you have questions, please contact Ryan Smith at Ford Motor Company Corporate (313) 322-1785 or email at rsmit291@ford.com.