Go Fast Bits GFB Under-Drive Pulley Kit

Fits 2004–2010 Subaru WRX and STI

Part #: 2010

Overview

The GFB 04-10 WRX/STI 3 Piece Under-Drive Pulley Kit is a high-performance upgrade designed for Subaru enthusiasts seeking improved engine responsiveness and a lighter rotating mass. Crafted from a single billet of 6061-T6 aluminum and precision CNC machined, this pulley kit offers a durable, lightweight solution that enhances your vehicle's acceleration and throttle response without requiring additional tuning or supporting modifications. It’s an ideal choice for drivers looking to optimize their car’s performance with a straightforward bolt-on upgrade that combines quality craftsmanship with functional benefits.

Key Features

This pulley kit features a meticulously engineered design aimed at reducing the rotational inertia of key engine components. The lightweight construction helps your engine rev more freely, providing a more immediate throttle response and a feeling of increased agility during spirited driving. The kit includes pulleys for the crankshaft, alternator, and power steering, all CNC machined from high-grade aluminum for precise fitment and longevity. The under-drive design ensures minimal parasitic losses while maintaining reliable operation of essential accessories, making it a practical upgrade for performance-minded Subaru owners.

Construction & Design

Manufactured from a single billet of 6061-T6 aluminum, each pulley is CNC machined to exacting tolerances. The lightweight yet robust construction ensures durability and consistent performance under demanding driving conditions. The precision machining provides a perfect fit, reducing vibrations and noise while supporting optimal accessory operation.

Driving Feel & Feedback

By reducing the rotational mass of the engine accessories, this pulley kit helps improve throttle response and acceleration, giving your vehicle a more immediate and engaging driving experience. The lightweight design also contributes to a smoother engine feel, especially during high-rev scenarios, enhancing overall driving enjoyment.

Installation & Fitment

The kit is designed for straightforward installation with no need for additional modifications or tuning. It replaces the stock pulleys directly, providing a reliable, bolt-on upgrade that fits 2004 through 2010 Subaru WRX and STI models.

What’s Included

The package includes three lightweight pulleys for the crankshaft, alternator, and power steering, along with all necessary hardware for a complete installation.

Ideal For

This pulley kit is perfect for Subaru enthusiasts looking to enhance their vehicle’s responsiveness and reduce engine rotational weight, whether for daily driving, spirited canyon runs, or track days. It offers a simple yet effective upgrade for those aiming to maximize their car’s performance potential.