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Authorized Brand Dealer
Fulfillment From Multiple U.S. Warehouses
Enthusiast Owned & Supported
Easy Financing Available!
Authorized Brand Dealer
Fulfillment From Multiple U.S. Warehouses
Enthusiast Owned & Supported
Easy Financing Available!
Authorized Brand Dealer
Fulfillment From Multiple U.S. Warehouses
Enthusiast Owned & Supported
Easy Financing Available!
Authorized Brand Dealer
Fulfillment From Multiple U.S. Warehouses
Enthusiast Owned & Supported
Easy Financing Available!
Authorized Brand Dealer
Fulfillment From Multiple U.S. Warehouses
Enthusiast Owned & Supported
Easy Financing Available!
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CSF
CSF 8321 High-Performance Auxiliary Radiator for Select 2021-2025 BMW M2/M3/M4 (G8X)
This product will be available for sale in 2 weeks, but you can pre-order now to receive 10% discount!
Fits select 2021-2025 BMW M2, M3, and M4 models (Base, Competition, CS, and CSL). This CSF High-Performance Auxiliary Radiator is a heavy-duty cooling solution designed to replace the fragile OE plastic-tank units that are prone to failure under track conditions or increased boost levels.
Constructed with a 2-row 42mm core, this radiator utilizes CSF’s exclusive B-Tube Technology, which increases the tube surface area for heat transfer by 15% compared to standard oval tubes. The ultra-efficient 5mm multi-louvered fins maximize airflow and cooling recovery, while the 100% all-aluminum TIG-welded tanks offer superior pressure resistance over factory components. This multi-fit design works on both the left and right sides of the vehicle and features OEM-style quick-connect inlets and outlets for a true drop-in installation.
- Manufacturer Part Number: 8321
- Core Dimensions: 2-row, 42mm high-performance core
- Exclusive B-Tube Technology for 15% more heat dissipation surface area
- Ultra-efficient 5mm tall fins with multi-louvered design
- Satin black finish for a discreet OEM+ appearance
- Includes detachable rock guard for added protection
- Direct fit using factory quick-connect fittings and mounting points
- Sold individually (Note: G8X applications use two auxiliary radiators)
- Individually leak and pressure tested
🔧 Fitment & Compatibility
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2024-2025 | BMW | M3 | Competition xDrive |
| 2024 | BMW | M3 | CS |
| 2021-2026 | BMW | M4 | Base |
| 2021-2026 | BMW | M4 | Competition |
| 2022-2026 | BMW | M4 | Competition xDrive |
| 2025 | BMW | M4 | CS |
| 2023 | BMW | M4 | CSL |
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Atlus
1340 Cobb Dr, Unit 1, Eustis, FL 32736
352-234-4458
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Sat: 9:00 am – 2:00 pm
Sun: Closed
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If you can find the part for a lower price from an authorized dealer/shop, we'll match the price! Reach out to Hello@AtlusAuto.com, our live chat located at the bottom right of your screen, or request an Atlas Price Guarantee, or visit our dedicated APG page to submit a request.
CSF 8321 High-Performance Auxiliary Radiator for Select 2021-2025 BMW M2/M3/M4 (G8X)
Note: Images are for illustrative purposes only. The actual product may vary in appearance or contents. Please read the full description and verify the item you're receiving.
This product will be available soon, but you can pre-order now to get on the list before others!
US Based Support - In Florida
30 Days Satisfaction Guarantee
Price Match
If you can find the part for a lower price from an authorized dealer/shop, we'll match the price! Reach out to Hello@AtlusAuto.com, our live chat located at the bottom of your screen, or request an Atlas Price Guarantee, or visit our dedicated APG page to submit a request.
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Share:
Fits select 2021-2025 BMW M2, M3, and M4 models (Base, Competition, CS, and CSL). This CSF High-Performance Auxiliary Radiator is a heavy-duty cooling solution designed to replace the fragile OE plastic-tank units that are prone to failure under track conditions or increased boost levels.
Constructed with a 2-row 42mm core, this radiator utilizes CSF’s exclusive B-Tube Technology, which increases the tube surface area for heat transfer by 15% compared to standard oval tubes. The ultra-efficient 5mm multi-louvered fins maximize airflow and cooling recovery, while the 100% all-aluminum TIG-welded tanks offer superior pressure resistance over factory components. This multi-fit design works on both the left and right sides of the vehicle and features OEM-style quick-connect inlets and outlets for a true drop-in installation.
- Manufacturer Part Number: 8321
- Core Dimensions: 2-row, 42mm high-performance core
- Exclusive B-Tube Technology for 15% more heat dissipation surface area
- Ultra-efficient 5mm tall fins with multi-louvered design
- Satin black finish for a discreet OEM+ appearance
- Includes detachable rock guard for added protection
- Direct fit using factory quick-connect fittings and mounting points
- Sold individually (Note: G8X applications use two auxiliary radiators)
- Individually leak and pressure tested
🔧 Fitment & Compatibility
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2024-2025 | BMW | M3 | Competition xDrive |
| 2024 | BMW | M3 | CS |
| 2021-2026 | BMW | M4 | Base |
| 2021-2026 | BMW | M4 | Competition |
| 2022-2026 | BMW | M4 | Competition xDrive |
| 2025 | BMW | M4 | CS |
| 2023 | BMW | M4 | CSL |
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