2021+ BMW M2 / M3 / M4 G80 S58 CSF Performance Auxiliary Radiators
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Details
2021, 2022, 2023, 2024, 2025, BMW M2 / M3 / M4, G8X, S58, CSF High-Performance Auxiliary Radiators, Heat Exchanger Upgrade for S58 Engine, (2) Needed, but can replace (1) at a time - 8321
- Sold Individually – all applications use 2 auxiliary radiators
- Multi-Fit – Fits Both Left & Right Side
- 2-Row – 42mm High-Performance Core
- Ultra Efficient 5mm Tall Fins with a Multi-Louvered Design for Maximum Surface Area Contact
- Tank Volume and Core Size Increased
- 100% All-Aluminum TIG-Welded Construction
- OEM Style “Quick Connect” Inlet/Outlet
- True “Drop-in Fit” Requires No Modifications to Install
- Includes Detachable Rock Guard
- Individually Leak and Pressure Tested
- High-Performance Upgrade Suitable for Professional Racing, Street Performance, or OEM Replacement
- Satin Black Finish for OEM+ Look
- 2 Year Limited Warranty
- Applications:
- 2021+ BMW G80 M3 (incl. Competition & CS) – 6MT & ZF8 Auto
- 2021+ BMW G82/G83 M4 (incl. Competition, CSL, & CS) – 6MT & ZF8 Auto
- 2022+ BMW G81 M3 (incl. Competition) – 6MT & ZF8 Auto
- 2022+ BMW G87 M2 (incl. Competition) – 6MT & ZF8 Auto
- OEM Part Number:
- BMW: 17 11 8 095 285
An industry-leading reputation and overwhelming success with BMW cooling has made CSF the #1 cooling choice for the G8X M3/M4/M2. CSF is leading the way in BMW G8X (S58) Cooling and adding another product to the Power Cooling Package. Now CSF is pleased to announce the release of the BMW G8X M3/M4/M2 High-Performance Auxiliary Radiators.
The new CSF Auxiliary Radiators are a great addition to the massively successful G8X Cooling Suite. Like the other cooling systems on the G8X, the aux rads do a pretty good job in stock form. However, once you start adding a lot of power and pushing the car in aggressive driving conditions, the factory systems start to show its limitations. As more and more owners keep pushing the limits of their S58, CSF is here to keep them cool.
Design & Engineering
CSF designed the coolers to be a true “Drop-in Fit” for easy installation fitting both left and right sides. Each cooler mounts in the factory location and uses the OEM quick connections. The High-Performance Auxiliary Radiators work in conjunction with the rest of the cooling system to reduce temperatures. They not only help keep temperatures in optimal ranges, but prolong the heat soak threshold. There’s nothing worse than having your track session cut short because you need to do a cooldown lap.
OEM vs CSF
Compared to the OEM G8X coolers, the CSF units are a significant upgrade. The TIG welded aluminum tanks are much larger than the OE plastic tanks offering superior strength and fluid volume. A larger 2-row 42mm core increases cooling efficiency and capacity. This high efficiency core uses CSF’s Exclusive B-Tube Technology and latest 5mm fin technology, maximizing airflow and heat dissipation. These 5mm fins significantly increase the heat exchange surface area improving overall cooling efficiency and recovery while still maintaining good airflow.
100% All-Aluminum construction ensures the best performance and durability. The mounting pins and brackets are much stronger and more durable than the OE plastic pod mounting system. In addition, the black finish provides extra protection and offers a stealthy look behind the grilles of your F8X.
*Because each auxiliary radiator is used for a different system you can elect to replace one at a time. For those looking to further improve the Charge Air Cooling system replace the right side auxiliary radiator. Those looking to improve the engine cooling system should replace the left side.
**Perfect drop-in fit in the factory location. The aluminum mounting pins on the CSF #8321 vs the OE plastic offers more stable mounting and overall durability.
More Information
| Part Number | 8321 |
|---|---|
| Part Brand | CSF |
| Type of Part | Cooling |
| Engine Fitment | S58 |
| Length | 16 |
| Width | 15 |
| Height | 5 |
| Weight | 8.000000 |
Reviews
Fitment
2021, 2022, 2023, 2024, 2025, BMW M2 / M3 / M4, G8X, S58, CSF High-Performance Auxiliary Radiators, Heat Exchanger Upgrade for S58 Engine, (2) Needed, but can replace (1) at a time - 8321
- Sold Individually – all applications use 2 auxiliary radiators
- Multi-Fit – Fits Both Left & Right Side
- 2-Row – 42mm High-Performance Core
- Ultra Efficient 5mm Tall Fins with a Multi-Louvered Design for Maximum Surface Area Contact
- Tank Volume and Core Size Increased
- 100% All-Aluminum TIG-Welded Construction
- OEM Style “Quick Connect” Inlet/Outlet
- True “Drop-in Fit” Requires No Modifications to Install
- Includes Detachable Rock Guard
- Individually Leak and Pressure Tested
- High-Performance Upgrade Suitable for Professional Racing, Street Performance, or OEM Replacement
- Satin Black Finish for OEM+ Look
- 2 Year Limited Warranty
- Applications:
- 2021+ BMW G80 M3 (incl. Competition & CS) – 6MT & ZF8 Auto
- 2021+ BMW G82/G83 M4 (incl. Competition, CSL, & CS) – 6MT & ZF8 Auto
- 2022+ BMW G81 M3 (incl. Competition) – 6MT & ZF8 Auto
- 2022+ BMW G87 M2 (incl. Competition) – 6MT & ZF8 Auto
- OEM Part Number:
- BMW: 17 11 8 095 285
An industry-leading reputation and overwhelming success with BMW cooling has made CSF the #1 cooling choice for the G8X M3/M4/M2. CSF is leading the way in BMW G8X (S58) Cooling and adding another product to the Power Cooling Package. Now CSF is pleased to announce the release of the BMW G8X M3/M4/M2 High-Performance Auxiliary Radiators.
The new CSF Auxiliary Radiators are a great addition to the massively successful G8X Cooling Suite. Like the other cooling systems on the G8X, the aux rads do a pretty good job in stock form. However, once you start adding a lot of power and pushing the car in aggressive driving conditions, the factory systems start to show its limitations. As more and more owners keep pushing the limits of their S58, CSF is here to keep them cool.
Design & Engineering
CSF designed the coolers to be a true “Drop-in Fit” for easy installation fitting both left and right sides. Each cooler mounts in the factory location and uses the OEM quick connections. The High-Performance Auxiliary Radiators work in conjunction with the rest of the cooling system to reduce temperatures. They not only help keep temperatures in optimal ranges, but prolong the heat soak threshold. There’s nothing worse than having your track session cut short because you need to do a cooldown lap.
OEM vs CSF
Compared to the OEM G8X coolers, the CSF units are a significant upgrade. The TIG welded aluminum tanks are much larger than the OE plastic tanks offering superior strength and fluid volume. A larger 2-row 42mm core increases cooling efficiency and capacity. This high efficiency core uses CSF’s Exclusive B-Tube Technology and latest 5mm fin technology, maximizing airflow and heat dissipation. These 5mm fins significantly increase the heat exchange surface area improving overall cooling efficiency and recovery while still maintaining good airflow.
100% All-Aluminum construction ensures the best performance and durability. The mounting pins and brackets are much stronger and more durable than the OE plastic pod mounting system. In addition, the black finish provides extra protection and offers a stealthy look behind the grilles of your F8X.
*Because each auxiliary radiator is used for a different system you can elect to replace one at a time. For those looking to further improve the Charge Air Cooling system replace the right side auxiliary radiator. Those looking to improve the engine cooling system should replace the left side.
**Perfect drop-in fit in the factory location. The aluminum mounting pins on the CSF #8321 vs the OE plastic offers more stable mounting and overall durability.
