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

With over five decades of specialized expertise in radiator manufacturing, CSF stands as a leader in delivering high-performance cooling solutions tailored for the demanding needs of Subaru WRX and STI models. The CSF 08-14 Subaru WRX / STI / 15-21 Subaru WRX 2-Row 42mm Race-Spec Radiator - Black exemplifies this commitment, engineered to maintain optimal engine temperatures under both everyday driving conditions and rigorous motorsport environments.

This radiator is meticulously designed with a 2-Row core incorporating CSF’s proprietary B-Tube Technology. Unlike conventional oval-shaped “O” tubes, the “B-tube” design features a unique cross-section that is seam-brazed to enhance structural integrity. This innovative approach allows for the use of thinner and lighter aluminum material without compromising strength, resulting in superior cooling efficiency. The “B” shape increases the heat transfer surface area by approximately 15% compared to traditional tubes, effectively doubling the cooling capacity within the same spatial constraints. This design facilitates dual liquid laminar flow, optimizing coolant movement and heat dissipation.

Complementing the advanced core design, the radiator employs ultra-efficient multi-louvered fins that are precisely aligned to maximize airflow through the core. Each fin is engineered to 6.5mm in height and features a multi-louvered pattern that significantly increases the surface area contact between air and coolant, thereby enhancing heat rejection. These specifications have been rigorously tested in CSF’s wind-tunnel laboratory to ensure peak performance.

Installation is straightforward and reliable, as the CSF WRX/STI radiator is a true “drop-in fit” replacement requiring no modifications. The CNC-machined and welded OE-style mounting brackets guarantee exceptional durability and a perfect fitment. Inlet and outlet connections are designed to match OEM standards, enabling the reuse of original or aftermarket hoses without compatibility issues. This ensures a seamless integration into the vehicle’s cooling system, maintaining factory-level reliability while delivering enhanced performance.

Features

• High-Performance Core Featuring CSF’s Exclusive B-Tube Technology for Superior Heat Transfer
• Core Equipped with Ultra-Efficient 6.5mm Tall Multi-Louvered Fins to Maximize Surface Area and Airflow
• Constructed from 100% All-Aluminum with TIG-Welded Joints for Maximum Strength and Longevity
• CNC Machined Mounting Brackets for Precise Fit and Enhanced Durability
• Innovative “Multi-Fit” Combo Pipe and Plug Design Included for Versatile Installation
• True “Drop-in Fit” Design Eliminates the Need for Modifications During Installation
• Individually Leak and Pressure Tested to Ensure Reliability and Performance
• Finished in Black for a High-End, Stealth Appearance
• Compatible with Manual Transmission Models Only
• Replaces and Supersedes CSF Part #7042

Applications