Koyo (Koyorad) Performance Radiator: Toyota GR Yaris GXPA16 / GR Corolla MZEA12 G16E-GTS MT 2020+

Koyo Performance Radiator – Toyota GR Yaris GXPA16 / GR Corolla MZEA12 G16E-GTS MT 2020+

Application: Toyota GR Yaris | 4BA-GXPA16 (3D Hatch) | G16E-GTS 1.6L Turbo Petrol AWD | Manual Transmission Application: Toyota GR Corolla | MZEA12 | G16E-GTS 1.6L Turbo Petrol AWD | Manual Transmission

Part Number: KH013831

The GR Yaris and GR Corolla are two of the most exciting homologation specials in decades — purpose-built rally-derived performance cars sharing Toyota's bespoke G16E-GTS 1.6L three-cylinder turbo and AWD platform. The G16E-GTS is a highly stressed engine that generates serious heat, and with both models increasingly popular on track and in rally events, cooling performance matters.

Koyorad's all-aluminium radiator is a direct bolt-in performance upgrade for both the GXPA16 and MZEA12, 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: KH013831
• Core Thickness: 48mm
• Core Dimensions (H × W): 625 × 394/404mm
• Tube Pitch: 58/58 × 410mm
• Inlet / Outlet Diameter: Ø35mm (left & right)
• 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: KH013831
• Toyota OEM: 16400 18050

Fitment

• Year · Make · Model · Chassis · Submodel
• 2020+ · Toyota · GR Yaris · 4BA-GXPA16 (3D Hatch) · GR – G16E-GTS 1.6L Turbo Petrol AWD (200kW)
• 2022+ · Toyota · GR Corolla · MZEA12 · GR – G16E-GTS 1.6L Turbo Petrol AWD (224kW)

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