Stage X Subaru EJ Series Dry Sump Drive Pulley Upgrade Kit

Upgrade to a 34mm wide pulley for better belt grip and reliability

This is a complete kit for upgrading earlier-generation (pre-2025) Stage X Subaru EJ series dry sump systems to the latest 34mm wide drive pulley. The wider pulley gives significantly better belt engagement and grip, reducing the risk of belt slip under high engine loads and sustained rpm, particularly in demanding motorsport environments.

For systems with the narrower 28mm pulley, this kit contains everything needed to bring them up to the current specification.

Key benefits

• Increased belt grip: the wider 34mm pulley gives the drive belt more surface contact, improving reliability under extreme loads and reducing the risk of slippage.
• Complete conversion kit: includes all the components required for installation, with no custom fabrication or additional parts needed.

What is included

• 34mm wide oil pump drive pulley
• Matching hardware and spacers
• Any required alignment or mounting components
• Installation instructions

Compatibility

• For Stage X Subaru EJ dry sump systems (pre-2025)
• Not compatible with OEM or other aftermarket sump systems
• Required when upgrading older kits to the 34mm pulley

Recommended for

• Subaru EJ engine builds using Stage X dry sump systems (pre-2025)
• Race, rally, time attack or other high-performance applications
• Systems showing belt wear or slippage, or owners who want to bring their dry sump system up to date

If the kit already includes the 34mm pulley (standard from 2025 onward), this upgrade kit is not required.