Koyo (Koyorad) Performance Radiator: Subaru Impreza / WRX STI / Legacy / Liberty / XV MT 2008-2021

Koyo Performance Radiator – Subaru Impreza / WRX STI / Legacy / Liberty / XV MT

Application: Subaru Impreza / WRX STI / Legacy / Liberty / XV | EJ20 / EJ257 / FB20 Petrol AWD | Manual Transmission

Part Number: VH091662 / KV091662

The EJ-series Subaru platform is one of the most popular and enduring performance foundations in the world — from the Impreza and WRX STI to the Legacy/Liberty GT and XV. Whether it's a street build, a rally car, or a track weapon, keeping coolant temperatures stable is fundamental to getting the most out of these turbocharged boxer engines under sustained load.

Koyorad's all-aluminium radiator is a direct bolt-in performance upgrade across the GH8, GRB, BL5, BP5, VAB, and G-series platforms, engineered to the same factory fit and mounting points as the OE unit. 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

• Part Number: VH091662 / KV091662
• Core Thickness: 36mm
• Core Dimensions (H × W): 340 × 677/701mm
• Tube Pitch: 43/43 × 713mm
• Inlet / Outlet Diameter: Ø38mm (bottom)
• Construction: All Aluminium, Nocolok Brazed, Heliarc Welded
• Transmission: Manual (MT)
• Fan Shroud: Retains OEM mounts
• Hoses: Compatible with stock radiator hoses
• Fitment: Direct bolt-in, no modifications required

Cross Reference

• Koyorad: VH091662 / KV091662
• Subaru OEM: 45111 AG010 / 45111 AG011 / 45111 AG030 / 45111 AG031 / 45119 AG010 / 45119 AG030 / 45119 FG010 / 45119 FG030 / 45119 FG050 / 45119 GA010 / 45119 SC010 / 45119 SC090 / 45119 VA000 / 45119 VA010

Fitment

• Year · Make · Model · Chassis · Submodel
• 2003+ · Subaru · Impreza · CBA-GH8 · EJ25 Petrol AWD
• 2008–2009 · Subaru · Impreza / WRX STI · CBA-GRB · EJ25 Petrol AWD
• 2003+ · Subaru · Legacy / Liberty · TA-BL5 (4D Sedan) · EJ25 Petrol AWD
• 2003+ · Subaru · Legacy / Liberty · TA-BP5 (5D Wagon) · EJ20 Petrol AWD
• 2003+ · Subaru · Legacy / Liberty · UA-BL5 (4D Sedan) · EJ25 Petrol AWD
• 2003+ · Subaru · Legacy / Liberty · UA-BP5 (5D Wagon) · EJ20 Petrol AWD
• 2014+ · Subaru · WRX STI · GBA-VAB (4D Sedan) · EJ25 Petrol AWD
• 2011+ · Subaru · WRX STI · G3 (4D Sedan) · EJ257 2.5L Turbo Petrol AWD
• 2011+ · Subaru · XV · G4 (5D Hatch) · FB20 2.0L Petrol AWD

Installation Notes

• WRX models with 13mm turbo return pipe: Trim the return pipe as required. The optional coolant port uses an M14-1.25 thread.
• Automatic transmission vehicles: Compatible, however an external transmission oil cooler is required — sold separately.

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