The warranty from Ford is voided due to the application of the Ford Racing performance packages. If you do purchase such a vehicle, make sure the dealer gives you a copy of the limited warranty statement. Per Ford:
FORD RACING LIMITED WARRANTY STATEMENT
Ford Racing Parts are not Genuine Ford Parts. All Ford Racing Parts are aftermarket parts. Therefore, they may not be used in any application that requires the use of Genuine Ford Parts. The use of Ford Racing parts and components may impact the performance characteristics of other systems of the vehicle. When operating properly, Ford Racing parts and components have the potential to adversely impact other systems of the vehicle. Except as set forth below, such damage is the sole responsibility of the consumer and is not covered by this Limited Warranty.