This is a bolt on system that significantly reduces steering effort and diminishes steering wheel jerk caused by uneven rough terrain. It's a torque-sensing unit that increases assistance as torque or resistance increases at the wheels. Unit mounts under the dash. This Cub Cadet Volunteer Electra Steer kit fits on all 2006-2015 models. This kit is BIGGER, BADDER, & BETTER than our earlier successful models.