You'll need a battery, a brushless motor or standard motor and a remote control.
I'd post a pic on things you'd need but these things are very diverse and the choices on what to run are endless.
He'll you can even run a nitro on it and off you go. Pricing on those parts varies from used, new, what output, the list goes on and on...
That's what makes these HPI R/C cars fun.
Key information for those interested or doubting pricing, mmm, eh, ah, this kit new was retailing at $275...a nice jump DOWN for it and it is NEW.