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High-Flow 31.5mm (+1mm) Exhaust Valves for 4G63T

Unlock more power from your 4G63T engine with the GSC Power Division 31.5mm (+1mm) Chrome Polished Exhaust Valve set. By increasing the head size by 1mm over the factory standard, these valves significantly improve exhaust gas scavenging, allowing your engine to breathe more efficiently under high-boost conditions. This set is an essential upgrade for those looking to maximize the potential of their cylinder head during a performance build.

Technical Advantages

• Oversized Design: 31.5mm head diameter (+1mm over stock) for increased flow capacity.
• Material: High-grade alloy with chrome polished finish for extreme heat resistance.
• Performance: Reduces backpressure, allowing for faster turbo spool and increased top-end power.
• Compatibility: Designed for 1990-1999 DSM and 2005-2006 Mitsubishi Lancer Evolution 1-9.
• Reliability: Engineered to maintain structural integrity under high-RPM and high-heat environments.

These oversized valves are a popular choice for builders aiming for significant horsepower gains. By allowing more exhaust volume to exit the combustion chamber, you reduce the risk of detonation and lower exhaust gas temperatures. The chrome-polished surface finish is designed to minimize friction and buildup, ensuring that your engine performs at its peak for longer periods. When combined with a performance camshaft and ported cylinder head, these valves provide the airflow necessary to reach your performance goals. Explore the full range of engine upgrades at GGCRACING.