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Supercharger Pulley Upgrades for R52 & R53 MINI Cooper S A 15% reduction in the supercharger pulley diameter of the MINI Cooper S increases boost by more than 4 pounds, resulting in a dyno-measured gain of over 20 horsepower AT THE WHEELS. Maximum boost is achieved at lower RPM, giving more power in the mid-range of your MINI Cooper S.
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