CSF High-Performance auxiliary radiator for the 2020+ Toyota GR Supra and its BMW B58 siblings, the Z4, M240i, M340i and M440i. CSF redesigned the included detachable aluminum rock guard so it doesn't block core surface area the way the OEM plastic guard does on an aftermarket core, validated in CSF's in-house wind tunnel. The unit runs a 2-row 42mm ultra-high-performance core with CSF's exclusive B-Tube technology and 6.5mm multi-louvered fins, in 100% all-aluminum TIG-welded construction with a thermal black protective coating. CNC-machined brackets and OEM-style quick-connect fittings make it a true drop-in fit on both the left and right side; two are required per vehicle.
| Type | High-performance auxiliary radiator (air-to-water charge cooler heat exchange) |
| Material | 100% all-aluminum, TIG-welded |
| Core | 2-row, 42mm (CSF B-Tube technology) |
| Fins | 6.5mm tall multi-louvered |
| Inlet / Outlet | OEM-style quick-connect, CNC-machined mounting brackets |
| Finish | Thermal black protective coating |
| Fit | Drop-in fit, no modifications; fits both left and right side |
| Included | Detachable aluminum rock guard |
| Warranty | 2-year limited warranty |
This part fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2023-2025 | BMW | M240i | Base |
| 2022-2025 | BMW | M240i xDrive | Base |
| 2020-2025 | BMW | M340i | Base |
| 2020-2025 | BMW | M340i xDrive | Base |
| 2021-2026 | BMW | M440i | Base |
| 2022-2025 | BMW | M440i Gran Coupe | Base |
| 2021-2026 | BMW | M440i xDrive | Base |
| 2022-2025 | BMW | M440i xDrive Gran Coupe | Base |
| 2022-2026 | BMW | Z4 | M40i |
| 2020 | BMW | Z4 | M40i First Edition |
| 2020-2021 | BMW | Z4 | sDrive M40i |
| 2019-2026 | BMW | Z4 | sDrive30i |
| 2024 | Toyota | GR Supra | 45th Anniversary Edition |
| 2021-2022 | Toyota | GR Supra | A91 Edition |
| 2023 | Toyota | GR Supra | A91-MT Edition |
| 2020-2026 | Toyota | GR Supra | Base |
| 2020 | Toyota | GR Supra | Launch Edition |
| 2026 | Toyota | GR Supra | MkV Final Edition |
| 2020-2026 | Toyota | GR Supra | Premium |
Shipping: In-stock orders placed before 3 PM EST ship the same day, and everything else ships within 24 hours. Standard, expedited, and overnight options are available at checkout. Backordered items ship as soon as we get them back in stock. Contact us for lead times. See the full Shipping Policy.
Returns: 30-day returns on new, unused items in original packaging. See the full Refund Policy.
