sounds like his folks are investing in their future putting him through med school to be a neurosurgeon. an expensive as all hell investment, but some folks are just wired like that. best thing to be is humble about it all, not everybody is born with a silver spoon in their mouths, so if you flaunt it, it's a good chance all your friends will be shallow, fair weather friends only, when the shit hits the fan, they'll turn you out or forget you every existed.
and 22's aren't going to help that beasts performance, look cool, sure, get you any better traction, hells no. Buy a nice set of 20's (or whatever is the stock diameter), and go as wide as you can and buy the stickiest tires money will buy and a turbo kit upgrade for it. personal feelings of course, it's your mom and dads money, spend it as you will