It all depends, technically they the FP Tune after the 3/36k is considered an aftermarket part. Aftermarket parts technically have to be proven to cause the problem for them to void warranty. Here’s an in depth article I did for the Explorer ST, but mostly everything applies to all other...
I am sure it makes a difference, but the FP tunes are just canned tunes. If you want a tune, go all the way and get a custom tune from someone like Livernois.
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