That makes sense, Thank you!Technically something can only void a warranty if the installed part is suspected/proven of contributing to the particular failure in which you’re seeking warranty repair. So, if a wheel bearing has failed and you go to get it repaired under warranty, they can’t claim that your air filter voided the warranty. You can reference the Consumer Products Warranty Act of 1975 (also referred to as the Magnuson-Moss Warranty Act)
In general, dealerships don’t care too much about air filter replacements... especially if it’s just the filter and not an entire intake, especially if it’s the same make as something they offer (like the Airaid model which is identical to the one sold by ford performance.)
However, if you’d rather be safe than sorry, you can always keep your existing paper air filter and re-install it if you ever go in for warranty work. Also, as a few members have mentioned, it’s not a bad idea to keep it around for use while the reusable filter is drying after a cleaning.