[LittleRaven]

If I replaced my air filter with a wix air filter would that void any part of my warranty?

 

[sailor]

Moved to the MkIII section.

No, that is a normal maint. item and it's a stock type part that wouldn't be questioned.

In the letter of the rules you are allowed to use any maint. parts that meet spec., and are not limited to Ford branded items in the maint of the car (Oil, filters etc. are the most common items of this type)

 

[Twenty]

Technically, replacing/upgrading parts does not by itself void warranties. A warranty will only be voided if something goes wrong (hence the need for making a claim) and a modification can be proved to be the cause of the problem.