I will be honest with you. With that particular vehicle, I would recommend just putting a stock servo back into it. With cheaper models I don't think it is worth putting a lot of money towards the car. So what I would recommend doing is phoning up Exceed and see if you can get a steering servo. If the vehicle is fairly new maybe they can give you a free one. I have never dealt with Exceed so I don't know how good there customer service is. It being your sons first car, it's not a bad idea not spending a lot of money to see if your son likes the hobby. Once you find out if he wants to stay in the hobby, getting a RC that's a little more mainstream would be a good idea. But until then, use the Tnunderfire.