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

CSF Aluminum Radiator for WRX/STI — 2-Row Core with B-Tube Technology Keep your Subaru WRX/STI cool on the street or at the track. CSF brings over five decades of radiator engineering to a high-performance, all-aluminum radiator built for boosted engines, high-horsepower builds, and motorsports use. Key Features 2-Row Core — Optimized for compact fitment with excellent heat rejection. B-Tube Technology — Innovative "B"-shaped tubes increase heat transfer area ~15% vs. conventional oval tubes, enabling dual liquid laminar flow and superior thermal efficiency. Lightweight, Strong Construction — Seam-brazed B-tubes allow thinner aluminum walls while delivering greater strength than traditional welded "O" tubes. Multi-Louvered Precision Fins — Application-specific fin geometry aligned for maximum airflow and tested in CSF wind-tunnel labs for proven performance. Street & Track Ready — Designed to withstand repeated heat cycles and higher coolant loads found in racing and modified engines. Benefits Expect lower operating temperatures, improved cooling consistency under boost, and reduced risk of heat-related power loss. The CSF radiator is a direct-fit, performance-oriented upgrade that balances durability, efficiency, and weight savings. Upgrade your cooling system with CSF — engineered cooling performance you can rely on.