CSF Aluminum Radiator for BMW E46 M3 Triple-Pass Flow Structure

CSF Aluminum Radiator for BMW E46 M3 — Triple-Pass Flow Structure Upgrade your E46 M3 cooling system with the CSF high-performance all-aluminum radiator engineered for street and track. Backed by over five decades of radiator manufacturing expertise, this unit delivers superior heat rejection, durability, and consistency under demanding driving conditions. Key Features Triple-pass flow structure routes coolant across the core three times for lower outlet temperatures and improved thermal stability. 2-row core with CSF B-Tube Technology — patented B-shaped tubes increase surface area (~15% more than standard tubes) and enable dual liquid laminar flow for enhanced heat transfer. Lightweight, stronger construction — brazed B-tubes allow thinner aluminum walls that are stronger than conventional welded O-tubes. Precision multi-louvered fins — optimized fin geometry, aligned per application and validated in CSF wind-tunnel testing for maximum airflow and heat rejection. Track-ready performance — ideal for high-horsepower builds, spirited street driving, and motorsports environments requiring reliable cooling. Benefits Expect lower operating temperatures, improved cooling reserve, and consistent performance during extended track sessions or heavy load driving. The CSF radiator is a direct-fit, high-efficiency solution built to protect your engine and maintain peak performance. Perfect for BMW E46 M3 owners seeking a durable, high-capacity cooling upgrade with proven thermal advantages and race-proven engineering.