Tomei Valve Spring Kit 4B11 | Mitsubishi Evo X (TA304A-MT02A)

Enhanced Valvetrain Performance

Upgrade your Mitsubishi Lancer Evolution X (4B11) with the Tomei Valve Spring Kit for precise camshaft control at high RPM. Premium NHK507 material and nitride treatment deliver durability and fatigue resistance for aggressive builds.

Improved Engine Stability

Reduce valve float, bounce, and surge with these springs that maintain seat pressure under elevated boost and extreme track conditions. Reliable up to 8,500 rpm, they provide consistent control through heat cycles for sharper throttle response and cleaner high-rev operation.

Enhanced Camshaft Compatibility

Pair these springs with high-lift cams or use them in a dependable street/track setup to improve initial response, preserve valve timing accuracy, and support engine performance. Trust Tomei’s rigorous pre-production testing for a valvetrain upgrade you can count on.