Cometic C4574-051 MLS Head Gasket 101mm for Subaru EJ255/EJ257 Engine

Engine Fitment

• Subaru EJ255 (Version 2) and EJ257 turbocharged engines
• 2006 Saab 9-2X
• 2004-2006 Subaru Baja
• 2004-2013 Subaru Forester
• 2004-2014 Subaru Impreza (including WRX/STI variants)
• 2005-2012 Subaru Legacy
• 2005-2009 Subaru Outback
• 2013-2014 Subaru WRX

Fitment Notes

• 101mm bore - verify this matches your block, especially if it has been bored oversize
• Same gasket is used on both sides of the boxer engine - order two for a complete set
• Confirm your engine is the EJ255 (V2) or EJ257 variant, not the earlier EJ255 V1, which uses a different bore/gasket spec
• No orientation/side specification listed - confirm with your engine builder if unsure

Features

• MLS (Multi-Layer Steel) construction using 3 layers of stainless steel for strength and durability
• Outer layers coated with Viton (FKM) rubber, heat resistant to 482°F (250°C)
• Well-suited to high-boost turbo applications
• No sealants or re-torquing required after installation
• Suitable for aluminum-head-to-aluminum-block applications
• Resists corrosion and rebounds well under repeated thermal cycling

Specifications

• Gasket type: MLS (Multi-Layer Steel)
• Bore: 101mm
• Thickness: .051"
• Layers: 3
• Orientation: None (same gasket both sides)
• UPC: 191070005603

Included Components

• 1x MLS cylinder head gasket, 101mm bore (order 2 for a complete set)

Product Description

The Cometic C4574-051 is a 3-layer MLS cylinder head gasket engineered for Subaru's turbocharged EJ255 (Version 2) and EJ257 boxer engines, spanning a wide range of Subaru models including the WRX, STI, Legacy GT, Forester XT, Outback XT, Baja Turbo, and the Saab 9-2X. Built with Cometic's stainless steel Multi-Layer Steel construction, it's designed to handle elevated boost pressure while requiring no sealants or re-torquing after installation.

At 101mm bore and .051" thickness, this gasket provides reliable sealing for high-boost turbo builds, with Viton-coated outer layers rated to 482°F. Since Subaru's boxer engine uses the same gasket on both cylinder heads, you'll need two of these gaskets for a complete engine build.

This is a strong choice for EJ255/EJ257 owners doing a turbo upgrade, rebuild, or high-boost build across the WRX, STI, Legacy GT, Forester XT, or Outback XT platforms who need a durable, precisely engineered head gasket. Confirm your exact engine variant (EJ255 V1 vs. V2, or EJ257) and bore diameter before ordering, and remember to order a pair for a full engine build.