Alta Performance Supercharger Pulley 15%The quickest and easiest way to add 20+ Wheel HP to your MINI Cooper S! Body Design Constructed of lightweight 6061T6 aluminum to reduce rotational inertia and improve engine response Cross drilled holes increase belt grip and reduce slippage as the belt stretches Oversized belt retainers help prevent the belt from jumping off Shaft Coupler Design Features a stainless steel clamp on coupler for a secure grip on the supercharger shaft Proven to work
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