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 full size 800, 6x6, 800 Crew, Diesel, & Diesel Crew models made in 2011-2014. This kit is BIGGER, BADDER, & BETTER than our earlier successful models.