Push your BMW harder without worry thanks to the CSF High-Performance Auxiliary Radiator. Whether you are tearing through track laps or carving up back roads, this cooler keeps your B58 or N55 engine temperatures in check. No more waiting for heat soak to pass or losing power mid-session, your car feels sharper, more consistent, and ready to run at its full potential every time.

CSF designed these radiators with the track and street enthusiast in mind. Extensive testing, R&D, and real-world track sessions shaped the design. Dyno testing confirmed improved coolant recovery and better thermal management over OEM. The radiator performs under aggressive driving and high horsepower builds, keeping your engine out of limp mode and letting you focus on driving.

Precision Engineered Design

100 percent TIG-welded aluminum construction for durability and strength. 2-row 42mm high-performance core with CSF Exclusive B-Tube Technology. 5mm tall multi-louvered fins maximize heat dissipation. Larger tanks increase fluid volume and strength compared to OEM plastic units. Includes integrated mounting frame with satin black finish and detachable rock guard for extra protection. OEM style quick connect fittings ensure true drop-in installation. Each radiator is individually leak and pressure tested.

Configuration Options

Single unit sold individually. Multi-fit for left and right side applications on compatible vehicles. Works with the F87 M2 N55, F3X 340i/440i, and F2X M240i cooling suites.

Exhaust Tips & Customization

Not applicable, cooling upgrade only.

Production & Lead Time

Made to order with a focus on quality over speed. Expect a few weeks for production depending on demand. Each unit is built to perform under extreme conditions.

Fitment

2016 to 2018 BMW F87 M2 N55
2016 to 2018 BMW F3X 340i, 340i xDrive
2017 to 2019 BMW F3X 340i GT xDrive
2017 to 2020 BMW F3X 440i, 440i xDrive, 440i Gran Coupe, 440i xDrive Gran Coupe
2017 to 2020 BMW F3X 430i, 430i xDrive, 430i Gran Coupe, 430i xDrive Gran Coupe
2017 to 2021 BMW F2X M240i, M240i xDrive

Benefits

• 2-row 42mm core with CSF B-Tube Technology for maximum cooling
• 5mm tall fins with multi-louver design for improved heat exchange
• All-aluminum construction with TIG welding for strength and reliability
• Detachable rock guard protects from road debris
• OEM quick connect fittings for true drop-in installation
• Works with professional racing setups or aggressive street builds
• Keeps engines below heat soak threshold for consistent performance
• Satin black finish for an OEM plus look
• Individually pressure and leak tested

NOTE: OFF ROAD USE ONLY