CSF All-Aluminum 42mm 2-Row B-Tube Radiator for 1999-2005 BMW 3-Series and Z4 (3055)

Fits select 1999-2005 BMW 3-Series (323i, 325i, 328i, 330i) and Z4 models.

Maintain optimal engine temperatures on the street or track with the CSF High-Performance All-Aluminum Radiator (MPN: 3055). This heavy-duty cooling solution replaces the failure-prone factory plastic-tank radiator with a robust, TIG-welded aluminum unit designed for high-horsepower builds and grueling motorsport environments. It features a direct drop-in design that accepts all factory components, including OEM quick-connect hoses, fan shrouds, AC condensers, and mounting brackets.

At the heart of this radiator is CSF’s exclusive B-Tube technology. Unlike standard "O" shape tubes, the B-tube design uses a seam-brazed internal structure that increases heat transfer surface area by approximately 15%. This creates a stronger, lighter core that offers the cooling efficiency of two smaller tubes within a single 42mm 2-row footprint. The core is finished with 6.5mm multi-louvered fins, precision-calculated in wind-tunnel testing for maximum airflow and heat rejection.

• 2-Row 42mm core featuring exclusive CSF B-Tube Technology
• CNC machined "Quick-Connect" inlet/outlet connections and mounting brackets
• Ultra-efficient 6.5mm multi-louvered fins for maximum surface area
• Hand-welded all-aluminum construction with a smooth satin finish
• Race-style all-aluminum drain plug
• Direct drop-in fitment requiring no vehicle modifications