The Eibach ERS Coil-Over Spring enhances suspension performance with an 1100 lbs/in rate. Measuring 8.00 inches long with a 2.50-inch inner diameter, this single high-tensile steel spring is designed for universal coilover systems. Ideal for high-performance race setups, it provides consistent response under extreme loads. Professional installation and tuning are required. Powder-coated for durability, it includes a limited lifetime manufacturer warranty.