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V-belt pulleys work by driving a vehicle's accessories at a slower rate than previously set factory settings. The controlled speed means the engine spends less effort spinning the performance pulleys and the other gadgets attached to it. The reduced workload on the engine translates to extra power given to driving the wheels forward. Many car enthusiasts attest to the significant engine boost the performance pulleys provide and this mechanism has now become a standard fixture in modified and even in stock cars.