CSF 8321 BMW G8X M3 / M4 & G87 M2 Auxiliary Radiator
CSF 8321 BMW G8X M3 / M4 & G87 M2 Auxiliary Radiator is backordered and will ship as soon as it is back in stock.
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The CSF 8321 is an individual auxiliary radiator for S58-powered G87 M2 and G8X M3/M4 applications. It is configured for installation on either the left or right side.
A two-row, 42mm B-Tube core, 5mm fins and detachable guard form an all-aluminum replacement for the original side radiator. The vehicle uses two auxiliary radiators; one unit lets you replace a single side, while a full pair requires a quantity of two.
Specifications
| Specification | Details |
|---|---|
| Part number / family | 8321 |
| Quantity | One auxiliary radiator |
| Engine | BMW S58 |
| Core | Two-row, 42mm B-Tube |
| Fin height | 5mm |
| Position | Left or right |
| Construction | TIG-welded aluminum |
| Protection | Detachable rock guard |
| Finish | Black |
Fitment and configuration: This is the G8X/G87 auxiliary radiator. S55 F8X models use a different part, CSF 8258.
Vehicle applications
| Years | Vehicle | Engine / transmission | Notes |
|---|---|---|---|
| 2023-2026 | BMW M2 | Turbocharged 3.0L L6 | — |
| 2026 | BMW M2 CS | Turbocharged 3.0L L6 | — |
| 2021-2026 | BMW M3 | Turbocharged 3.0L L6 | — |
| 2021-2026 | BMW M3 Competition | Turbocharged 3.0L L6 | — |
| 2022-2023 | BMW M3 Competition xDrive | Turbocharged 3.0L L6 | — |
| 2024-2026 | BMW G80/G81 M3 Competition xDrive | Turbocharged 3.0L L6 | — |
| 2024 | BMW G80/G81 M3 CS | Turbocharged 3.0L L6 | — |
| 2021-2026 | BMW G82/G83 M4 | Turbocharged 3.0L L6 | — |
| 2021-2026 | BMW G82/G83 M4 Competition | Turbocharged 3.0L L6 | — |
| 2022-2026 | BMW G82/G83 M4 Competition xDrive | Turbocharged 3.0L L6 | — |
| 2025-2026 | BMW G82/G83 M4 CS | Turbocharged 3.0L L6 | — |
| 2023 | BMW G82/G83 M4 CSL | Turbocharged 3.0L L6 | — |
Product FAQs
Are both auxiliary radiators included?
No. This listing supplies one radiator. Order two if replacing both sides.
Do I need separate left and right part numbers?
CSF specifies that the 8321 can be used on either side with the appropriate fitting arrangement.
Is this interchangeable with the F80 M3 auxiliary radiator?
No. The S55 F8X application uses CSF 8258. Select by generation and engine, not just the M3 or M4 badge.
Related CSF cooling products
- CSF 8215 BMW G8X M3 / M4 & G87 M2 Front Heat Exchanger
- CSF 8266 BMW G8X M3 / M4 & G87 M2 Engine Oil Cooler
Pit Garage is an automotive service and performance parts shop in the Los Angeles area. Ask Pit Garage about selecting this cooling component for your engine, transmission and installed equipment.
CSF 8321 BMW G8X M3 / M4 & G87 M2 Auxiliary Radiator
