CSF High-Performance Auxiliary Radiator for BMW G8X M3/M4/M2 2021-2025
(Fits- BMW G8X M3/M4/M2 2021-2025)
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CSF High-Performance Auxiliary Radiator for BMW G8X M3/M4/M2 2021-2025
Upgrade the cooling system on your BMW G8X with CSF High-Performance Auxiliary Radiators, engineered for the M3, M4, and M2 platforms. The factory auxiliary radiators perform well under normal driving, but increased horsepower and extended track use can push the stock system beyond its limits. CSF delivers a purpose-built solution designed to handle higher heat loads while maintaining consistent engine temperatures.
With over 50 years of radiator manufacturing experience, CSF developed these auxiliary radiators to support both street-driven builds and dedicated track cars. Each unit features a dual-row aluminum core that increases coolant capacity and improves heat dissipation compared to the factory design. This results in more stable operating temperatures during aggressive driving, repeated pulls, and high ambient conditions. At the center of the design is CSF’s exclusive B-Tube Technology. Unlike traditional oval tubes, these specially engineered B-shaped tubes increase internal surface area by approximately 15 percent. This allows for improved heat transfer efficiency within the same space, helping the radiator pull more heat out of the coolant. The design also supports dual liquid laminar flow, which promotes more consistent cooling across the core.
CSF pairs this tube design with precision multi-louvered fins that are optimized for airflow. Each fin is aligned and tested to ensure maximum heat rejection without restricting airflow through the radiator. This balance is critical for maintaining performance in both street and motorsports environments. Installation is straightforward with a true drop-in fit. These auxiliary radiators are built to match OEM specifications, including CNC-machined mounting brackets and factory-style inlet and outlet connections. You can reuse original hoses or pair them with upgraded aftermarket components without modification.
For G8X owners looking to support higher power levels, reduce heat soak, and improve long-term reliability, CSF auxiliary radiators provide a proven cooling upgrade backed by decades of engineering and real-world testing.
Details:
- Sold Individually - all applications use 2 auxiliary radiators
- Multi-Fit - Fits Both Left & Right Side
- 2-Row - 42mm High-Performance Core Featuring CSF's Exclusive B-tube Technology
- 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
Fitment:
- 2023-2025 BMW G87 M2 Turbocharged 3.0L L6
- 2021-2025 BMW G8X M3 Turbocharged 3.0L L6
- 2021-2025 BMW G8X M3 Competition Turbocharged 3.0L L6
- 2022-2025 BMW G8X M3 Competition xDrive Turbocharged 3.0L L6
- 2024 BMW G8X M3 CS Turbocharged 3.0L L6
- 2025 BMW G8X M3 CS Turbocharged 3.0L L6
- 2021-2025 BMW G8X M4 Turbocharged 3.0L L6
- 2021-2025 BMW G8X M4 Competition Turbocharged 3.0L L6
- 2021-2025 BMW G8X M4 Competition xDrive Turbocharged 3.0L L6
- 2023-2025 BMW G8X M4 CSL Turbocharged 3.0L L6