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

CSF Radiator for WRX/STI — 2-Row Aluminum Core with B-Tube Technology Upgrade cooling for street and track. CSF leverages over five decades of radiator engineering to deliver a high-performance, all-aluminum radiator tailored for Subaru WRX/STI applications. 2-row aluminum core for increased cooling capacity without excess bulk. B-Tube Technology — uniquely shaped tubes brazed at the seam for strength, reduced weight, and improved heat transfer vs. conventional oval tubes. Approximately 15% more tube surface area than standard designs, enabling dual laminar liquid flow and the efficiency of two smaller tubes in one footprint. Precision-engineered multi-louvered fins tuned per application and validated in a wind-tunnel for maximum airflow and heat rejection. Ideal for high-horsepower builds and motorsports use where reliable thermal control is critical. This CSF radiator balances lightweight construction with superior thermal performance to keep temperatures down under sustained load. Fitment and fin design are optimized for WRX/STI chassis packaging for a direct, high-efficiency upgrade.