2-Piece Underdrive Pulley Kit for Subaru Models

This GFB 2-piece underdrive pulley kit replaces the factory crank and alternator pulleys with lightweight aluminium underdrive components. By slowing accessory speeds relative to engine speed, the kit reduces parasitic load while also lowering rotating mass.

Crank and Alternator Pulley Package

The kit includes both the crank pulley and alternator pulley, along with the correctly sized belts required for installation, ensuring proper belt alignment and operation when fitted as a matched set.

Underdrive Design

Underdrive pulley ratios reduce the speed of belt-driven accessories such as the alternator and power steering pump, lowering the load placed on the engine under operation.

Lightweight Aluminium Construction

Both pulleys are manufactured from lightweight aluminium to reduce inertia compared to the factory steel pulleys while maintaining durability and fitment accuracy.

Direct Bolt-On Installation

Designed as a direct replacement for the factory pulleys on the listed vehicles, the kit installs without modification when the correct application is selected.