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 |
Shipping: In-stock orders placed before 3 PM EST ship the same day, and everything else ships within 24 hours. Standard, expedited, and overnight options are available at checkout. Backordered items ship as soon as we get them back in stock. Contact us for lead times. See the full Shipping Policy.
Returns: 30-day returns on new, unused items in original packaging. See the full Refund Policy.
