MINI Cooper S R52 R53 Supercharger Pulley Kit KAVS Belt - 15%. This listing is for a brand new KAVS pulley and the matching belt to accommodate the smaller pulley size. If you have done your research you know that this is the optimal size for the stock supercharger as anything above that will spin the unit past its max limits. This should still give you plenty of power considering JCW is on a less powerful 11% pulley. Any questions feel free to ask.The item "MINI Cooper S R52 R53 Supercharger Pulley Kit KAVS Belt 15%" is in sale since Saturday, December 4, 2021. This item is in the category "Vehicle Parts & Accessories\Car Parts & Accessories\Engines & Engine Parts\Timing Components & Kits\Tensioners & Pulleys". The seller is "ioa2nis" and is located in London. This item can be shipped to United Kingdom.