CSF has over 5 decades of experience manufacturing radiators. So when it comes to keeping your engine cool and your Audi Quattro/B1/B2/B3/B4 running at its best, a CSF High-Performance All-Aluminum Radiator is the obvious choice. Designed to perform on the street or at the track, a performance radiator is a must-have for both high horsepower builds as well as race vehicles which need added cooling performance in motorsports environments. This radiator features a 2-Row core with CSF's exclusive B-Tube Technology: Unlike a regular oval shape "O" type radiator tube, CSF uses a specially engineered tube in the shape of a "B". These "B-tubes" are carefully formed and then brazed over the seam to seal. CSF is able to use thinner and lighter aluminum material (with better cooling efficiency) because this design is actually stronger than normal "O" shape tubes that are welded. The design (inlet in the middle of the tube that is seam brazed) increases the heat transfer surface area of the tubes by approximately 15% over regular tubes - producing the efficiency of two smaller tubes vs. one large tube within the same space criteria. With "B-tubes" you are able to get "dual liquid laminar flow". CSF also uses ultra efficient multi louvered fins that are carefully and precisely aligned to maximize airflow through each radiator core. Fin specifications are carefully measured and calculated for each application, and tested for maximum heat rejection efficiency in our wind-tunnel lab.The CSF Audi Quattro/B1/B2/B3/B4 radiator is a true "Drop-in fit" design requiring no modifications to install. OE style brackets are all CNC machined and welded for the best durability possible. Inlet/Outlet connections are designed to match the OE connections so you can reuse OEM hoses or aftermarket. Trust the cooling experts at CSF for the best performing, highest-quality, and most reliable radiators.

Features

• 2-Row, 42mm Ultra-High-Performance Dual Pass Core
• Cooling Tubes with CSF's Exclusive B-Tube Technology
• 6.5mm Tall Ultra Efficient Fins with a Multi-Louvered Design for Maximum Surface Area Contact
• CNC Machined Mounting Brackets and OEM Style Inlet/Outlet
• 100% All Aluminum TIG-Welded Construction
• Satin Black Finish for OEM+ Look
• True Plug-and-Play "Drop-in Fit" Installation Requires Absolutely No Modifications
• Individually Leak and Pressure Tested
• Modular design for use with or without Auxiliary Radiator
• Multiple Fan Shroud Mounting Points for use with all Fans (incl. High Performance RS2 Model)
• Multiple overflow pipe locations on top end tank for different model variations
• Sensor ports are M22x1.5 (if your OEM Sensor is an early model M20x1.5 please be aware you will need an adapter)
• 2-Year Limited Warranty

Applications

• 1991-1992 Audi 80 - 2.3L L5
• 1988-1991 Audi 90 - 2.3L L5
• 1980-1984 Audi 4000 - 2.2L L5
• 1988-1992 Audi 80 Quattro - 2.3L L5
• 1990-1991 Audi 90 Quattro 20v - 2.3L L5
• 1988-1989 Audi 90 Quattro Base - 2.3L L5
• 1986-1987 Audi Coupe GT - 2.2L L5
• 1990-1991 Audi Coupe Quattro 20v - 2.3L L5
• 1983-1985 Audi Quattro - 2.2L L5

OEM Part Numbers

• Audi: 893121251G
• Audi: 893121251S