Koyo Performance Radiator – Mitsubishi Lancer Evolution IV / V / VI 4G63 MT
Application: Mitsubishi Lancer Evolution IV / V / VI | CF-CP9A / E-CN9A / GF-CP9A | 4G63 | Manual Transmission
Part Numbers: KH030939 (Koyorad) / HH030939 (Coore)
The Lancer Evolution IV, V, and VI are among the most iconic all-wheel-drive performance cars ever built — homologation specials born from Mitsubishi's World Rally Championship programme, powered by the legendary turbocharged 4G63. Whether you're running a stock Evo or a built motor pushing serious power, keeping coolant temperatures in check is critical to protecting the 4G63 under sustained high-load conditions on track or on the stages.
Koyorad's all-aluminium KH030939 is a direct bolt-in performance upgrade engineered specifically for manual transmission Evo IV, V, and VI models. Nocolok furnace brazed, precision TIG welded by hand, and triple pressure tested — it retains all OEM fan shroud mounts and stock hose connections with no modifications required.
Why Koyorad?
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Precise Tube & Fin Alignment — Strict quality control ensures optimal coolant flow and maximum heat transfer efficiency across the entire core.
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Nocolok Furnace Brazing — All tubes, fins, headers, and brackets are bonded in a state-of-the-art Nocolok furnace, creating a structure that resists vibration, road debris, and the elements.
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Billet Filler Neck — Precision-machined billet filler necks are fitted to every unit for superior strength, durability, and a reliable seal.
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OE-Specific Mounting — Application-specific mounting points for fan shrouds, inlet/outlet hoses, and top/bottom pins ensure a pain-free, no-modification install.
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Hand-Crafted Heliarc Welds — Each radiator is individually Heliarc welded by hand, creating the strongest possible aluminium-to-aluminium bond across all components.
