Bsmith PC

my wife and i just purchased a new 2023 is 350 f sport and would like to try to get a bit more out of the motor. a saleperson suggested a plug and play tuner and indicated it would not void the warranty as it was removeable and would leave no trace on the ecm. does anyone have a brand recommendation for such a product, there seems to be quite an assortment of them available. have some experience with tuners on diesel trucks but nothing like this so far.