I plan on installing 285/75 tires from my current 245/75 and was wondering what negative effects I will experience by not tuning/calibrating for the tire change? The only programmer out right now is the Bully Dog Power Pup, but I want to wait it out for other companies to release theirs. So if I installed the tires for now until I get a programmer, what am I risking? I'm sick of looking at my 245/75 tires! Thanks.