the only hop up I recommend is the KFactory rear 1.5degree hubs, besides that I dont think the car needs any upgrades , as far as spares i recommend at least 1 set of front and rear arms,steering hubs and some drive shaft blades. If you have a issues with your rear driveshaft blades coming out try this modification, I used the cap of a sharpie marker and cut it about 5mm long and slid them over the rear diff, its a perfect fit and with this mod i have no problems with the rear blades