Koyo Performance Radiator – Lexus IS250 / IS350 GSE20 / GSE21 / GSE25 2005+
Application: Lexus IS250 / IS350 | DBA-GSE20 / DBA-GSE21 / DBA-GSE25 | 4GR-FSE / 2GR-FSE | 2005+
Part Numbers: KH011937 (Koyorad) / KH011937 (Coore)
The Lexus IS250 and IS350 represent the sharp end of Toyota's rear-wheel-drive performance sedan lineup — refined, capable machines that are increasingly popular as track and street performance builds. The 4GR-FSE and 2GR-FSE engines are smooth, high-revving units that benefit from improved thermal management, particularly under sustained high-load driving conditions.
Koyorad's all-aluminium KH011937 is a direct bolt-in performance upgrade engineered specifically for the GSE20-series IS platform. 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.
