5 star tuning offers their own warranty that will come into effect if your ford warranty is denied.
Tuning a vehicle and hoping for warranty is a touchy subject, and it is something you have to accept. If you wanna play you gotta pay I guess. Ive had modded vehicles get warranty work, and Ive had ot fight to get warranty work on a stock vehicle. Neither is a guarantee.
But if you are worried about voiding, then you should probably not mod at all, because it will be a risk.
---------- Post added at 04:02 PM ---------- Previous post was at 04:01 PM ----------
The instance I was describing, I was more picturing a WOT pull where the motor blows. The dealer will be able ot see the boost levels in the logs, regardless of what you do.