Mini, like other BMW vehicles, uses a chassis code for each model. The first generation Minis were the R50/R52/R53. The R50 was the non "S" model with a normally aspirated engine. The R52 is the convertible and the R53 is the hatchback. read more
To make things confusing the R52 convertible was produced concurrently until 2008 so for two years there were Mini Cooper S models with either the supercharger or turbo. Even though the hatchback model had moved to the 2nd generation R56 with the turbo engine the convertible was still a 1st generation R52 Mini with the W11 supercharged engine. read more
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As a result the turbo model turns in far quicker acceleration figures, and in fact is allegedly not too far off the pace of the supercharged Cooper S Works model, which has a fair bit more power on paper. read more