CSF High-Performance All-Aluminum Radiator - Audi 4000 / 80 / 90 / Coupe / Quattro 5-Cyl (1980-1992)

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.

Specifications

This part fits:

Shipping

• In-stock orders placed before 3 PM EST ship the same day — everything else ships within 24 hours.
• Standard, expedited, and overnight options at checkout.
• Oversized items ship by freight and take longer.
• Backordered items ship as soon as stock lands — contact us for lead times.
• International orders: prices do not include VAT, duties, or import fees. Your country charges these at import and they are the buyer’s responsibility.

Returns

• 30-day returns on new, uninstalled items in original packaging with all hardware.
• Standard returns: 8% restocking fee, buyer pays return shipping. Both waived if the item is defective or we made the error.
• Installed or used parts can’t be returned — confirm fitment before you install.
• Special orders and custom items are final sale.
• Email us for return authorization before shipping anything back.

Full details: Shipping Policy · Refund Policy