2" / 54mm 4G Alternator Pulley & Shim Kit

Solve voltage drop issues at idle with this alternator pulley and shim kit. By increasing alternator output without excessive modification, you can maintain stable voltage under heavy electrical loads—whether from e-fans, fuel systems, or other accessories. This pulley kit optimizes charging performance at lower RPMs while keeping safe limits at wide-open throttle. Affordable, straightforward upgrade that delivers reliable electrical system support.