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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
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Sat: 9:00 am – 2:00 pm
Sun: Closed
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CSF 8321 High-Performance Auxiliary Radiator for Select 2021-2025 BMW M2/M3/M4 (G8X)
This product will be available soon, but you can pre-order now to get on the list before others!
US Based Support - In Florida
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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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