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The Ferrea valve spring kit for Mitsubishi Evo X 4B11T engines is a dual-spring upgrade designed to improve valve control in turbocharged applications. Replacing the stock springs with a dual arrangement, this kit focuses on preserving valve stability under boost and repeated high-load usage, providing a practical valvetrain component for enthusiasts tuning or maintaining forced-induction setups.
Ferrea Mitsubishi Evo X 4B11T Dual Spring Kit
