CSF 7042O High-Performance All-Aluminum 2-Row 42mm Radiator with Oil Cooler for Select Subaru 2005-2021

Fits select 2005-2021 Subaru WRX, WRX STI, Impreza, Legacy, Outback, Forester, and Crosstrek (various engines).

The CSF 7042O is a high-performance cooling solution engineered for both high-horsepower street builds and dedicated track vehicles. This all-aluminum radiator replaces restrictive factory units with a massive 42mm dual-row core and integrated oil cooler, providing the thermal capacity required for forced induction and sustained high-RPM use. This unit features CSF's exclusive B-Tube technology, which uses a seam-brazed "B" shape rather than a standard oval tube. This design increases the heat transfer surface area by approximately 15% and allows for thinner, lighter aluminum without sacrificing structural integrity.

To ensure maximum airflow efficiency, CSF utilizes 6.5mm multi-louvered fins, precision-aligned to maximize heat rejection. Every unit is finished with a 1-hour hand polish and features CNC-machined brackets for a true drop-in fit that accepts all OEM fan shrouds, hoses, and mounting points.

• Manufacturer Part Number: 7042O
• 2-Row 42mm Core featuring CSF B-Tube Technology
• Built-in oil cooler for improved drivetrain thermal management
• Ultra-efficient 6.5mm multi-louvered fin height
• CNC-machined quick-connect inlet/outlet and mounting brackets
• All-aluminum race-style drain plug and mirror-finish hand polish
• Direct fitment for OEM fan shrouds, AC condenser, and brackets