Go Fast Bits Underdrive Pulley Kit Subaru WRX 2008-2014 / STI 2008-2021

The GFB Pulley Kit includes crank, alternator, and power - steering pulleys along with the installation belt. Heavy stock pulleys waste power that could be used to move the car. This kit replaces the crank pulley with a lighter one, underdriving the power steering and alternator while keeping the A/C compressor at normal speed. Part #: 2014. The stock STI crank pulley weighs 5.51lb, and the WRX one weighs 4.63lb, while the GFB crank pulley is just .86lb. The stock power - steering pulley is .81lb, and the GFB version is .37lb. The stock alternator pulley is .36lb, and the GFB one is .14lb. The total mass of the GFB Pulley Kit is 1.38lb, compared to 6.69lb (STI) or 5.81lb (WRX) for stock pulleys, saving 5.31lb (STI) or 4.43lb (WRX). The alternator has a 16.5% underdrive, and the power steering has an 18% underdrive, with no A/C underdrive.

Using the GFB Pulley Kit is easy. First, gather all the tools you need. Then, carefully remove the stock pulleys from your Subaru WRX or STI. Install the new pulleys from the kit in their place, and don't forget to put on the provided belt. When installing, make sure the pulleys are properly aligned to avoid any issues. As for maintenance, check the tightness of the belt regularly. If it seems loose, adjust it as needed. Also, look for any signs of wear on the pulleys. If you notice any problems, like strange noises or vibrations, stop using the car and check the pulleys right away. This will help keep your car running smoothly and make the most of the power savings this kit offers.