i have a 2004. 5 and am considering a power pup set on tow (low setting) . since i dont want to leave a constant reflash trail in my computer is it worth while leaving it on that setting. i doubt that bringing my truck to the dealer for an oil change or other routine service will trip anything that will put my warranty in question. also at the low setting it appears that it will not put unnecessary stress on my drivetrain. i have guages . tell me the up and down side