Built to meet or exceed O.E.M. performance: Supplied with O.E.M. grade seals, O-rings, and boots to provide optimal sealing performance and longevity. Environmentally friendly coating applied to tie rods and lines to provide a clean appearance and prevent rust. Application-specific, in-line filter provided with each unit. No filter modifications required. Computerized spool valve balancing ensures exceptional steering feel. Each unit is performance tested to ensure perfect fit, function, and reliable performance.