John Cooper Works produced tuning kits for both the first-generation MINI Cooper and MINI Cooper S. Both versions were strictly dealer-installed accessories. With every JCW Tuning Kit came a John Cooper Works MINI Cooper Tuning Kit Certificate of Authenticity. While the John Cooper Works MINI Cooper S Tuning Kit is relatively common, the John Cooper Works MINI Cooper Tuning Kit is fairly rare.
Pictured below is a John Cooper Works MINI Cooper Tuning Kit certificate. It contains a unique tuning kit number, Mike Cooper’s signature, and tips for getting the best from your tuning kit. The certificate for the JCW MINI Cooper S Tuning Kit is similar.