Koyorad Performance Radiator | Lexus IS250 / IS350 GSE20 GSE21 GSE25 (2005+)

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?

• 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.

Specifications

Cross Reference

Fitment

Sold individually. 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.