Well it depends what you want. If you want longer runtime get the bearing ($19.99). If you want to go faster get the stage 2 motors ($15.99). If you want better handling get the AWD ($14.99) or the springs upgrade ($7.99) or the tires ($7.99). If you want your car to look cool get a body kit ($12.99) or lights ($5.99). I know there are other upgrades out there but I am too lazy to list them all.
