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.

Sam