Just asking for a freind of mine that is going to buy a hand held and is wondering if the predator will leave a shadow or evidence that it was there?? So if he goes in for warranty and takes the tune out will the dealer beable to see that it was modded etc? Its a 2010 1ton 6.0l Sierra. His ford you would have to untune and then drive around for a few days before taking it to the dealer?? Or at least so he told me. Anyone ever heard of this or think that it will cause any problems etc?? THanks for any info!!