The XB, XT, and XB-E all use the same front/rear suspension and drivetrain setup. The main differences are in the chassis layout. They all use the FG square drive, and the wheels/tires from many FG squared vehicles will work just fine. The stock motor is somewhat disappointing but its still faster than a decent gasoline car out of the box.
Im still running the stock wheels/tires, after replacing the foams of course. They are small light and very effective on the track. Sure I managed to strip one out but that was after several hours of runtime. A little JB weld, a dremel, saran wrap and itll be as good as new :D
I absolutely love mine.
Heres an action shot just for ya PBOrifice :D