We were allowed to use everything that came in the kit, so I used the extra pistons to lower the front end. I would drill them to fit the shaft and slide them on. It really helped to lower the front end. I hope you are allowed to use the radio of your choice, I really don't like the stock radio. We have a guy who was kicking our butt with 25c batteries. I guess it helped the car stick better, plus they last forever.