CSF's high-performance all-aluminum radiator is a plug-and-play drop-in for the Audi 4000, 80, 90, Coupe, and Quattro (B1/B2/B3/B4) 5-cylinder chassis, built for street and track use on high-horsepower and race builds. It uses a 2-row 42mm dual-pass core with CSF's exclusive B-Tube Technology, which raises heat-transfer surface area roughly 15 percent over standard tubes, plus 6.5mm multi-louvered fins for maximum airflow. A modular design supports use with or without the auxiliary radiator, with multiple fan-shroud mounting points and overflow-pipe locations for different model variations. Sensor ports are M22x1.5.
| Type | High-performance aluminum radiator |
| Material | 100% all-aluminum, TIG-welded |
| Core | 2-row 42mm dual-pass core with B-Tube Technology (~15% more heat transfer) |
| Fins | 6.5mm tall multi-louvered fins |
| Inlet / Outlet | OEM-style, CNC-machined; sensor ports M22x1.5 |
| Finish | Satin black (OEM+ look) |
| Fit | Plug-and-play drop-in; modular for use with/without auxiliary radiator |
| Warranty | 2-year limited |
This part fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 1980-1983 | Audi | 4000 | Base |
| 1982-1983 | Audi | 4000 | GT |
| 1982-1983 | Audi | 4000 | S |
| 1991-1992 | Audi | 80 | Base |
| 1988-1992 | Audi | 80 Quattro | Base |
| 1988-1991 | Audi | 90 | Base |
| 1990-1991 | Audi | 90 Quattro | 20v |
| 1988-1989 | Audi | 90 Quattro | Base |
| 1986-1987 | Audi | Coupe | GT |
| 1990-1991 | Audi | Coupe Quattro | 20v |
| 1983-1985 | Audi | Quattro | Base |
