Rxmotor Scion FRS / Subaru BRZ 3piece Motor Pulley KIT SET -Crank +Alternator +Water Red FITMENT: 2012-2014 Scion FR-S / 2012-2014 Subaru BRZ. Adds between 4-7 hp Lightweight aluminum crank pulley made from T6061 aluminum and anodized for durability These pulleys increase power by reducing the parasitic drag caused by factory accessory pulleys. Reducing the rotational inertia of your motor frees up horsepower. Reduces spin-up time and gives you that extra edge over. Increase throttle response