If you plan to race with it I would get the caster blocks for the front and all the toe-in/anti-squat plates for the rear of it. I bought the hardened spur gear for mine. I broke 4 of the stock ones since Xmas. I plan to buy the steering knuckles, all the lower suspension plates(front and rear) and the 13-15t pinions.

The car looks sweet without the stickers and stuff, and clean too. I went to the track two days after the snow melted off here. I haven't been able to get the wheels and wing to return to the nice white they were. They are reddis/brown now. LOL