This is a bolt on system that significantly reduces steering effort and diminishes steering wheel jerk caused by uneven terrain. It's a torque-sensing unit that increases assistance as torque or resistance increases at the wheels. Unit mounts under the dash. This Polaris Ranger UTV Electra Steer kit fits on all 2013-2015 Ranger XP 900 models. This kit is BIGGER, BADDER, & BETTER than our earlier successful models.