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

This amazing GFB Pulley Kit includes crank, alternator, and power - steering pulleys along with the necessary belt for installation. Heavy stock pulleys waste engine power that could be used to make your car go faster. With this kit, you can replace the heavy crank pulley with a lighter one. It underdrives the power steering and alternator, while keeping the A/C compressor running at normal speed. Part #: 2014. Stock Crank Pulley weighs 5.51lb (STI) or 4.63lb (WRX), while the GFB Crank Pulley is only .86lb. The GFB Power Steering Pulley weighs .37lb compared to the stock's .81lb, and the GFB Alternator Pulley is just .14lb against the stock's .36lb. The total mass of the GFB Pulley Kit is 1.38lb, and for stock pulleys, it's 6.69lb (STI) or 5.81lb (WRX), saving you 5.31lb (STI) or 4.43lb (WRX). The alternator has a 16.5% underdrive, and the power steering has an 18% underdrive, with no underdrive for the A/C.

Using this GFB Underdrive Pulley Kit is straightforward. First, make sure your car's engine is cool. Then, remove the old pulleys and replace them with the ones in the kit, following the included belt routing diagram to install the belt. It's important to note that you should check all the connections are tight after installation. For maintenance, regularly inspect the pulleys for any signs of wear, like cracks or excessive looseness. If you notice any issues, replace the affected pulley right away. Keep the pulleys clean to prevent dirt from causing damage. Also, remember that the alternator and power - steering underdrive settings are already optimized, so don't try to adjust them on your own.