The Torque Solution lightweight alternator pulley for Subaru FA/FB engines is an aftermarket pulley intended to reduce rotating mass on compatible Subaru applications. It replaces the factory alternator pulley with a lighter component to change rotational inertia. Use this pulley where the FA or FB series alternator pulley is specified for Subaru engines.
Torque Solution Subaru FA / FB Engine Lightweight Alternator Pulley