If both sizes are safe for the supercharger which one should you choose? The supercharger is only creating boost under acceleration, on a normal or even a spirited drive this is only occasional. However, at the track or an autocross event acceleration is sustained and frequent. If you use your MINI for these types of events it is better to use the 15% reduction. This is because the 17% pulley causes the supercharger to heat more rapidly and the warm air begins to negate the positive effects of the extra PSI earlier in the band.
This pulley will work on all supercharged MINI models except the JCW which already has a similarly reduced size pulley on the supercharger. Although this two part pulley is self-centering to help ease installation you may still want to check our dealer finder
for a CravenSpeed Authorized Installer near you. If you plan do on wrenching on your own, make sure you have a puller
designed to remove the MINI's press-fit OEM pulley. Our quick puller allows you to remove the OEM pulley without removing the tensioner. Notice: This product has NOT been certified for legal use in CA and other states adopting CA emissions standards under Section 177 of the Federal Clean Air Act of 1970.
Please check with laws in your area to make sure that your use of this product is compliant with current regulations in your jurisdiction.