GFB 08+ WRX/STi / 09+ Forester / 03-09 LGT 3 pc Underdrive/Non-Underdrive Pulley Kit

If you're looking to make your 2008-2014 Subaru Impreza feel more responsive, especially when you're getting on the throttle, this 3-piece pulley kit from Go Fast Bits is a solid option. By swapping out the factory crank, alternator, and power steering pulleys for lighter ones, you're reducing the rotating mass the engine has to spin up. This means less of the engine's torque is used just to get the pulleys spinning, and more of it can go to the wheels, making the engine feel more eager to rev.

These pulleys are machined from a single billet of 6061-T6 aluminum, which keeps the weight down significantly – up to an 85% reduction in rotating inertia compared to stock. This isn't just about shaving weight; it's about making the engine feel more lively. The kit is designed as a direct bolt-on performance upgrade, meaning you shouldn't need any other modifications or special tuning to see the benefits. For some applications, the kit also underdrives the accessories like the alternator and power steering pump, which further reduces the load on the engine at higher RPMs, though Go Fast Bits tests these thoroughly to ensure accessory performance isn't compromised.

This kit includes the crank, alternator, and power steering pulleys, along with the necessary belts. It's a well-built component that can make a noticeable difference in how your engine responds when you step on the gas.