The Cometic Subaru EJ25 Motor 04-06 SOHC/DOHC 101mm Bore .040in MLX Cylinder Head Gasket - C4578-040 is a precision-engineered head gasket with a 101mm bore and .040" compressed thickness.
The Cometic MLX Multi-Layer Steel (MLS) head gasket is engineered for high-performance and racing applications where OEM gaskets fall short. Featuring MLX Multi-Layer Steel (MLS) construction, this gasket uses multiple embossed steel layers for superior sealing under extreme cylinder pressures and temperatures. Precision CNC-machined to exacting tolerances, this gasket seals combustion, water jackets, and oil passages simultaneously — eliminating the need for multiple gaskets or sealing compounds.
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Material: MLX Multi-Layer Steel (MLS)
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Bore Size: 101mm
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Thickness: .040" compressed
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Part Number: C4578-040
Verified fitment: Subaru Forester (1998); Subaru Impreza (1998); Subaru Legacy (1999).