These shocks have been in development for over a year. ICON Vehicle Dynamics has taken their already perfect performing coil-over shocks and given it the heat dissipation and long lasting performance of a full blown race shock. All of this has been developed to bolt on and install with ease. They increase suspension travel and dramatically increase the capabilities of your FJ Cruiser's front suspension. These coil-over's are meant to be installed with an aftermarket uniball upper control arm kit to ensure the proper amount of wheel travel and to prevent premature ball joint wear.