These leaf springs are used for high Performance Street, drag and autocross. They lower the car 1 1/4" inches from stock. The leaf is specially designed with the leaf stack offset to the front to reduce wheel hop, and eliminate the use of a traction bar. These springs will also adapt to any bushing, stock rubber, polyurethane, or Del-a-lum bushings. No bushings are supplied with this performance spring. Note: When using this spring and Del-a-lum bushings, no rear sway bar will be required.