The Mini John Cooper Works was a high performance variant of the Second Generation Mini Cooper. Previously, Mini had offered a John Cooper Works tuning package that was often installed by dealers, but starting in 2009, the John Cooper Works became its own factory built variant. The JCW was largely based on the Cooper S, but it featured a range of improvements such as new exhaust, brakes, suspension, and differential. Mini offered the John Cooper Works in both hardop and convertible body styles, and the variant was offered until 2014.