CSF Aluminum Radiator for WRX/STI 2-Row Core with B-Tube Technology

CSF Aluminum Radiator for WRX/STI — 2-Row Core with B-Tube Technology Upgrade your Subaru WRX/STI cooling with CSF’s high-performance all-aluminum radiator. Engineered for street and track, this direct-fit radiator delivers superior heat rejection for high-horsepower builds, daily drivers, and motorsports applications. Key Features 2-row core optimized for increased cooling capacity while maintaining a compact profile. B-Tube Technology — patented B-shaped tubes provide ~15% more heat transfer surface area versus conventional O-tubes, enabling dual liquid laminar flow and improved thermal efficiency. Lightweight, strong construction — brazed B-tubes allow thinner aluminum walls without sacrificing strength. Multi-louvered fins precisely aligned for maximum airflow and tested in CSF’s wind-tunnel lab for peak performance. Street and track ready — engineered for durability under high-stress and high-temperature conditions. Why Choose CSF With over five decades of radiator manufacturing expertise, CSF combines proven materials and advanced tube/fins design to keep your engine cooler, reduce risk of overheating, and support sustained performance. Ideal for enthusiasts who demand reliable cooling under extreme use. Direct-fit, performance-driven, and track-proven — the CSF Aluminum Radiator is the smart cooling upgrade for your WRX/STI.