The WCC hollow tube Sway Bars are designed to offer a huge improvement in body roll and increased cornering grip. WCC Stage I Includes Sway Bars w/ Bushings Front & Rear WCC Stage II Includes Sway Bars w/ Bushings Front & Rear, Bushings, and Adjustable End Links Dramatically improves cornering potential, chassis balance and steering response. Besides offering exceptional handling improvements for street driving, the WCC sway bars work extremely well in autocross, road courses, and open road racing applications. The lightweight hollow sway bars are formed on a CNC machine and powder coated for style and durability. Use your existing stock end links to maintain a quiet ride, or order with our fully adjustable heim end links. Thanks to added adjustability, the new WCC sway bar package reduces body roll, increases vehicle control, and adds a new level of driver feedback and control to any late-model Corvette. Includes bushings and hardware. Diameter: Front is 34.9MM / Rear is 25MM. Wall thickness: Front Bar 6.35MM / Rear Bar 3.96MM PSI: Front 625 PSI Rear (3 way adjustable) 408 PSI Outter Setting 480 PSI Middle Setting 552 PSI Inner Setting These Sway Bars are available for all models of C5/C6 and C7 Corvettes.