From my Ford owners manual.
Damage Caused by Alteration or Modification
The New Vehicle Limited Warranty does not cover any damage caused by:
alterations or modifications of the vehicle, including the body, chassis, or components, after the vehicle leaves the control of Ford Motor Company
tampering with the vehicle, tampering with the emissions systems or with the other parts that affect these systems (for example, but not limited to exhaust and intake systems)
the installation or use of a non-Ford Motor Company part (other than a certified emissions part) or any part (Ford or non-Ford) designed for off-road use only installed after the vehicle leaves the control of Ford Motor Company, if the installed part fails or causes a Ford part to fail. Examples include, but are not limited to lift kits, oversized tires, roll bars, cellular phones, alarm systems, automatic starting systems and performance-enhancing powertrain components or software and performance "chips"
I voided my truck when it was two months old with Straight piped 4inch exhaust,175cc injectors,ball bearing turbo,open element air filter,high pressure oil pump,head studs,custom burned 6 program flip chip. You wanna play you gotta pay.