Koyorad Performance Radiator for Toyota GR Supra A90 / BMW Z4 G29 B58 2018+
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Description
Koyo Performance Radiator – Toyota GR Supra A90 / BMW Z4 G29 B58 2018+
Application: Toyota GR Supra (DB41/DB42) & BMW Z4 (G29) | B58B30C / B58 3.0L Turbo Inline-6 Petrol RWD
Part Number: HH423660 / KH423660
The A90 GR Supra is the return of an icon — and with the BMW-sourced B58 inline-six under the bonnet, it's a genuinely capable platform straight from the factory. But the B58 is also one of the most popular engines to tune right now, and as power levels climb, so does the demand on the cooling system.
Koyorad's all-aluminium radiator is a direct bolt-in performance upgrade for both the A90 GR Supra and the BMW Z4 G29, 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 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 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 | HH423660 / KH423660 |
| Core Thickness | 48mm |
| Core Dimensions (H × W) | 175 × 231/247mm |
| Tube Pitch | 64/64 × 249mm |
| Overall Width | 186mm |
| Construction | All Aluminium, Nocolok Brazed, Heliarc Welded |
| Fan Shroud | Retains OEM mounts |
| Fitment | Direct bolt-in, no modifications required |
Cross Reference
| Koyorad | HH423660 / KH423660 |
| Toyota / BMW OEM | 16400 WAA04 / 17118672237 |
Fitment
| Year | Make | Model | Chassis | Submodel |
|---|---|---|---|---|
| 2018+ | BMW | Z4 | G29 (2D Roadster) | M40i – B58B30C 3.0L Turbo Inline-6 Petrol RWD (250kW) |
| 2018–2020 | Toyota | GR Supra | DB41/DB42 (2D Coupe) | GTS – B58 3.0L Turbo Inline-6 Petrol RWD (250kW) |
Sold individually. Lead times may apply — contact us at iilumolab for availability and shipping estimates.
iilumolab is an Authorised Australian Distributor of Koyorad Performance Radiators.
Shop with confidence — all Koyorad products sold through iilumolab are genuine, backed by manufacturer support, and shipped from Australia.
If you're unsure whether this will fit your vehicle, contact our team of experts via email at hello@iilumolab.com and send through a few photos of the car for us to verify fitment.
Installation
We always recommend professional fitment for guaranteed satisfaction. If you're wanting a hassle-free installation, feel free to contact our friendly team as we offer installation services in-store at our Melbourne workshop. For more details, contact us here.
Note
Upon receiving the item, please ensure that the part is indeed the correct item you have ordered. This can be achieved by checking labels on the packaging. Please also ensure a proper test fit of the item is conducted prior to paint and/or installation. Returns/Warranty claims will be voided if the item has been tampered with, or is no longer in resalable/new condition.