Adding steering in the NB48 is easy as our box setup actually dialed out quite a bit. 16 would probably be too tall. Some are using a 14 instead of the stock 15. Our setups have primarily been developed around the front motor configuration. We are doing testing with rear motor and at this point it appears to calm the steering and make the car a little more stable on high traction high speed corners. The weight a little more to the rear appears to make the car less susceptible to catching a rut and traction rolling.