Horsepower TV sparked my interest in a programer. They used a programer on a stock '04 Cobra. It gained 40 rear wheel horsepower on the dyno. It seems most guys on this site use the Diablo. How does reprogramming the computer affect your Ford warranty?
No modification automatically "voids" your warranty, internet lore to the contrary.
Read your SVT warranty, and read the Magnuson-Moss warranty act.
Ford may deny a warranty claim if they can prove that the failure was caused by a modification, misuse, or improper maintenance.
Example, change pulleys, toast a blower, it's easy for them to prove that you ran the blower at speeds/pressures higher than they anticipated.... not warranted.
Change pulleys, have a front wheel bearing go bad... no impact on warranty coverage.
Change exhaust, two coil packs go bad... no impact on warranty coverage.
Add a snow-plow (will the F-150 Heritage snow-plow kit bolt up to our L's? A guy has to earn a living...) and the front wheel bearing goes bad... easy to prove that the weight/stress contributed to the failure... not warranted.
Add a snow-plow, lose compression in one cylinder... no impact on warranty coverage.
The "common sense", "everybody knows" answer on this topic is often wrong.