The original Take-Apart Coil-over System for Sport-Compact cars. This system has been refined over thousands of racing miles. Take PROGRESS technology to the track, and build a winner! FEATURES: Short Struts: 30mm shorter strut bodies for lower ride heights, improved ride quality and traction. Polyurethane Components: polyurethane Short Stops allow additional wheel travel. New strut top bushings and spring isolators also included. Take-Apart Design: Strut tops are threaded for easy revalving. Custom valving is simple to install for road racing and drag racing. "how-to" video available. Big Bore Size: Large 35mm piston and twin-tube cellular gas construction for consistent damping. Threaded Spring Perches: Ride Height adjustable 1" - 4" (1 - 2.5" Recommended). Detent locks collars in position every half turn. No lock ring necessary! Complete Systems: Includes Race Springs, Struts and necessary hardware. **Note Scion xB kit does not include rear shocks**