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The Supertech dual valve spring kit for Mitsubishi EVO X 4B11 engines supplies matched inner and outer springs intended to improve valve control and resist float at higher RPMs. The product notes to use the OEM seal-seat during installation. This dual arrangement gives added confidence in valve seating for EVO X 4B11 applications where extra valvetrain margin is required.
Supertech Mitsubishi EVO X 4B11 Dual Valve Spring Kit (Use OEM Seal-Seat)
