CSF 8258 BMW S55 M3 / M4 / M2 Competition Auxiliary Radiator
CSF 8258 BMW S55 M3 / M4 / M2 Competition Auxiliary Radiator is backordered and will ship as soon as it is back in stock.
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The CSF 8258 is a single auxiliary radiator for the S55 BMW M3, M4 and M2 Competition. Interchangeable fittings and plugs allow the same part to serve either side of the vehicle.
On these applications the left auxiliary radiator serves engine coolant and the right serves the charge-air cooling circuit. Each car uses two auxiliary radiators, but this listing supplies one. The two-row, 42mm B-Tube core carries CSF’s 2026 5mm Track-Spec fin update.
Specifications
| Specification | Details |
|---|---|
| Part number / family | 8258 |
| Quantity | One auxiliary radiator |
| Core | Two-row, 42mm B-Tube |
| Current fin specification | 5mm Track-Spec, 2026 update |
| Position | Left or right using supplied fittings and plugs |
| Left-side role | Engine coolant |
| Right-side role | Charge-air cooling |
| Protection | Detachable rock guard |
| Finish | Satin black |
Fitment and configuration: Order two if replacing both sides. This S55 auxiliary radiator is not the earlier N55 M2 application.
Vehicle applications
| Years | Vehicle | Engine / transmission | Notes |
|---|---|---|---|
| 2019-2021 | BMW F87 M2 Competition | Turbocharged 3.0L L6 | — |
| 2020-2021 | BMW F87 M2 CS | Turbocharged 3.0L L6 | — |
| 2015-2018 | BMW F80 M3 | Turbocharged 3.0L L6 | — |
| 2015-2020 | BMW F82/F83 M4 | Turbocharged 3.0L L6 | — |
| 2018-2020 | BMW F82/F83 M4 CS | Turbocharged 3.0L L6 | — |
| 2016 | BMW F82/F83 M4 GTS | Turbocharged 3.0L L6 | — |
Product FAQs
Is the price for a pair?
No. The 8258 is sold individually. Order two for a complete left-and-right replacement.
How can one part fit both sides?
The fittings and plugs can be arranged for either side. The left and right radiators connect to different cooling circuits on the listed S55 applications.
Will this fit an N55 M2?
No. The N55 M2 auxiliary radiator is a different application. Confirm the engine before selecting an F87 cooler.
Related CSF cooling products
- CSF 8075 BMW S55 M3 / M4 / M2 Competition Heat Exchanger
- CSF 8082 BMW S55 Top-Mount Charge-Air Cooler – Crinkle Black
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 8258 BMW S55 M3 / M4 / M2 Competition Auxiliary Radiator
