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This Boundary Subaru EJ oil pump assembly combines a high-flow 12mm billet gear with MartenWear surface treatment, delivered as a treated assembly for improved wear resistance. It replaces the factory pump in Subaru EJ engines to restore or enhance oiling performance while matching the engine’s original mounting and shim requirements.
Boundary Subaru EJ 12mm Billet Gear High Flow Shark Tooth MartenWear Treated Oil Pump Assembly
