STM Under-Driven Alternator Pulley with Raised Guides for Evo 4-9 *Backorder ETA 06/2026*

Backorder:
As of 02/2026 we are out of stock. We are working on a batch with a rough estimated ETA of around mid to late June 2026. We will fill all backorders first when they do get completed, so get your order in if you need one!

The STM Evo 4-9 10% under-driven alternator pulley with raised guides was originally designed to help stop the belt from jumping off at high RPM. This new revision makes the pulley 10% under-driven and lighter than stock, which lightens the load on your alternator. Fits all Evo 4/5/6/7/8/9 models and works with OEM and stock replacement belts.

Vehicle Fitment:
CN9A 1996-1997 Evolution IV
CP9A 1998-2000 Evolution V VI
CT9A 2001-2006 Evolution VII VIII IX

Features:
• Billet Aluminum
• Hard Anodized to help resist corrosion
• Lighter than OEM
• 10% under-driven
• 10% less wear on your alternator
• Works with stock belts
• Raised belt guides
• STM Products are made in the USA!
• Lifetime Warranty on STM Parts to the original purchaser against manufacturing defects.

Purchase Includes:
(1) Pulley

Shipping Times:
Typically ships in 1-4 days.

Also Available:
STM Evo 7/8/9 Alternator

See more STM Products