ok, on the shock. If you are a new driver then use the blues until you get better. If you are an experience racer, I would get the BB shocks and AE springs. If you are new and rich and have money to throw away, same as above, get BB shocks and AE springs.

If the rtr shocks are like new, run them till they wear out and ge the BB shocks. Honestly, if your new to racing, you wont even be able to fell the difference. Your better off buying tires and spending time at the track.