Description Reviews MINI Cooper S Exhaust Valve for all generation 2 cars. These are factory replacement valves from MINI to fix any bent valves you may have due to the engine being out of time and crashing into pistons. These will fit all generation 2 MINI Cooper S models with the N14 or N18 as well as the JCW engines. This is a brand new part ready for install, no machining of the valve itself is needed; but work on the head may and should be done. Sold as each; the car requires 8 exhaust valves, not all may need replacing depending on the scope of your project.