Koyo Performance Radiator - Toyota GR Supra A90 / BMW Z4 G29 B58 2018+
Koyo Performance Radiator - Toyota GR Supra A90 / BMW Z4 G29 B58 2018+
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Universal fit
No vehicle selection needed.
This part may still fit. Check the details below or contact us before ordering. Ask about fitment
Fitment not confirmed
This part may still fit. Check the details below or contact us before ordering. Ask about fitment
In Melbourne? Fit it in our workshop.
We fit parts in-house at the RevZone workshop. Book a time and bring your car in.
Description
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.
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 for availability and shipping estimates.
Specifications
- Brand
- Koyo
- 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
Shipping
Orders are processed within 1-2 business days (Monday to Friday), and orders placed before 12pm AEST are usually dispatched the same day. Once dispatched, standard shipping takes 3-7 business days and express 1-3, with tracking emailed as your order leaves.
If part of your order is out of stock, we'll contact you with the option to split the shipment or hold it until everything is ready. Read the full shipping policy.
Returns
You have 14 days from delivery to request a return on unused parts in their original packaging. Refunds incur a 15% restocking fee (20% for special orders), or choose store credit and the full purchase value is applied to your account.
Parts that have been test fitted, installed, or used can't be returned, and special-order or overseas-ordered items are assessed case by case. Faulty or incorrectly supplied items are always covered at no cost to you. Read the full returns policy.