COBB Tuning's new Coilover Sleeve System gives you the ability to customize the ride height of your vehicle while retaining the factory adjustable shock absorbers. Suspension movement has also been enhanced by replacing the stock rubber bushings with teflon-lined FK spherical-bearing top mounts that allow for full articulation of the suspension while maintaining linear spring movement.Handling is dramatically improved by utilizing more aggressive front and rear springs with a helper springs in combination to keep the rear spring seated through the full range of motion. Custom spring rates are also available