Description Reviews MINI Cooper S Exhaust Valve for all Generation 2 cars. This is a high quality replacement valve 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. This is the OEM part, as this time we can not get an aftermarket version.