CSF Audi B5 A4 1.8T High Performance All Aluminum Radiator

When you're pushing your 1997-2001 Audi A4 1.8T hard, whether on the street or the track, keeping engine temperatures in check is critical. This all-aluminum radiator from CSF is built to handle the extra heat generated by higher horsepower builds or demanding motorsports use. It’s designed as a direct replacement, meaning it fits right into your existing setup without needing any modifications.

CSF has been making radiators for over 50 years, and this one uses their exclusive B-Tube Technology. Instead of a standard oval tube, these B-tubes are seam-brazed and shaped to increase the heat transfer surface area by about 15% compared to regular tubes. This design allows for a dual liquid flow, which is more efficient for cooling. The radiator also features multi-louvered fins that are precisely aligned to maximize airflow through the core, helping to reject heat effectively. The entire unit is TIG-welded for solid construction and is pressure tested to ensure it’s leak-free.

This radiator is specifically for manual transmission vehicles. It comes with CNC-machined mounting brackets that match OE style for durability and a straightforward installation. You can reuse your factory or aftermarket hoses thanks to the OE-style inlet and outlet connections. It’s a well-built component designed to keep your engine running cool under pressure.