Koyorad Performance Radiator: Mitsubishi Lancer Evolution 4/5/6 4G63 MT | HH030939

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 Japan) / HH030939 (Koyorad)

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?

• Precise Tube & Fin Alignment — Strict quality control ensures optimal coolant flow and maximum heat transfer efficiency across the entire core.
• 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.
• Billet Filler Neck — Precision-machined billet filler necks are fitted to every unit for superior strength, durability, and a reliable seal.
• OE-Specific Mounting — Application-specific mounting points for fan shrouds, inlet/outlet hoses, and top/bottom pins ensure a pain-free, no-modification install.
• Hand-Crafted Heliarc Welds — Each radiator is individually Heliarc welded by hand, creating the strongest possible aluminium-to-aluminium bond across all components.

Cross Reference

Fitment

Installation Notes

• MT Only — Manual transmission models only.
• Fan: Must use Evolution 7/8/9 fan.
• Evo 7/8/9 compatibility: Can be installed to Evolution 7/8/9 for better turbo/manifold clearance. Evo 6 upper hose required, stock fan will mount, but stock air intake system is not compatible.

Sold individually. Manual transmission fitment only. Lead times may apply — contact us at Coore for availability and shipping estimates.

Coore Performance & Aftermarket is an Authorised Australian Distributor of Koyorad Performance Radiators.
Shop with confidence — all Koyorad products sold through Coore are genuine, backed by manufacturer support, and shipped from Australia.

Browse more Koyorad parts at JDM Mods NQ