CSF 08-14 Subaru WRX / STI / 15-21 Subaru WRX 2-Row 42mm Race-Spec Radiator

With over five decades of dedicated expertise in radiator manufacturing, CSF stands as a benchmark in automotive cooling solutions. The CSF 08-14 Subaru WRX / STI / 15-21 Subaru WRX 2-Row 42mm Race-Spec Radiator exemplifies this legacy, delivering unparalleled cooling performance tailored specifically for Subaru WRX and STI models. Whether your vehicle is a high-horsepower street build or a competitive race car, this radiator ensures optimal engine temperature management under demanding conditions.

Engineered to excel both on the street and at the track, this radiator incorporates CSF's proprietary B-Tube Technology. Unlike conventional oval-shaped "O" tubes, CSF’s innovative "B" shaped tubes enhance structural integrity and thermal efficiency. These tubes are meticulously formed and brazed over the seam, enabling the use of thinner, lighter aluminum material without compromising strength. This design increases the heat transfer surface area by approximately 15% compared to standard tubes, effectively doubling the cooling efficiency within the same spatial constraints.

The unique "B-tube" configuration facilitates dual liquid laminar flow, optimizing coolant circulation for superior heat dissipation. Complementing this is the radiator’s core, featuring ultra-efficient 6.5mm tall multi-louvered fins. These fins are precisely aligned to maximize airflow through the core, enhancing heat rejection capabilities. Each fin specification is carefully calculated and rigorously tested in CSF’s wind-tunnel laboratory to guarantee peak thermal performance.

Installation is straightforward with the CSF WRX/STI radiator’s true "drop-in fit" design, requiring no modifications. The radiator includes CNC machined and welded OE-style mounting brackets, ensuring durability and precise fitment. Inlet and outlet connections are engineered to match original equipment specifications, allowing seamless integration with OEM or aftermarket hoses. This attention to detail underscores CSF’s commitment to quality, reliability, and ease of installation.

Key Features

• High-performance 2-row core utilizing CSF’s exclusive B-Tube Technology for enhanced strength and cooling efficiency
• Ultra-efficient 6.5mm tall multi-louvered fins designed for maximum surface area contact and airflow
• 100% all-aluminum TIG-welded construction, ensuring durability and corrosion resistance
• CNC machined mounting brackets for precise fit and long-lasting strength
• Innovative "Multi-Fit" combo pipe and plug design included for versatile installation options
• True "drop-in fit" requiring no modifications, preserving vehicle integrity
• Individually leak and pressure tested to guarantee reliability and performance
• Hand-polished with a 1-hour "mirror finish" for superior aesthetics and corrosion protection
• Designed exclusively for manual transmission applications
• Supersedes CSF part number #7042, offering improved performance and fitment

Applications