Originally Posted by SoCal 370Z

Look at it another way: He doesn't like the wheels, buys aftermarket, makes you a killer deal on the factory 19". He then buys some aftermarket goodies, decided not to install them, and passes a killer deal on the parts to you.

Hey, I'd be a lot more concerned if he were to sleep with your fiancee, while you're at your bachelor party, and then he appears at your wedding with the same tux as you. That's something to really worry about!