CSF 8355 High Performance Auxiliary Radiator for Select BMW 2016-2021 (M2 / 340i / 440i)

Fits select 2016-2021 BMW M2, M240i, 340i, 430i, and 440i models. This auxiliary radiator is designed to withstand the rigors of track use and high-performance street driving where OEM plastic-tank components often fail.

The CSF 8355 features a 42mm 2-row core utilizing CSF’s exclusive B-Tube technology for maximum heat dissipation. Unlike the factory unit which uses a plastic mounting pod prone to fatigue, this radiator is built with a 100% all-aluminum TIG-welded integrated mounting frame for superior durability. To protect the core from road debris and track-day punctures, it includes a detachable bolt-on rock guard. The unit is finished in satin black for an OEM+ appearance and utilizes factory-style quick-connect inlets and outlets for a true drop-in installation.

• Manufacturer Part Number: 8355
• 42mm 2-Row High-Performance Core
• Exclusive B-Tube Technology and 5mm tall ultra-efficient multi-louvered fins
• 100% All-Aluminum TIG-welded construction
• Integrated heavy-duty mounting frame replaces OE plastic pod
• Includes detachable bolt-on rock guard for puncture protection
• OEM-style “Quick Connect” inlet/outlet ports
• Individually leak and pressure tested
• Satin black finish for corrosion resistance and stealth appearance
• Multi-fit design: fits both left and right side (sold individually)