CSF Aluminum Radiator for BMW E39 M5/540i 2-Row Core B-Tube Technology

CSF Aluminum Radiator for BMW E39 M5/540i — 2-Row Core with B-Tube Technology Upgrade cooling performance for your BMW E39 M5 or 540i with CSF’s high-performance all-aluminum radiator. Built from over five decades of radiator engineering, this 2-row core unit is designed for street, high-horsepower and track use. Key Features B-Tube Technology: Proprietary "B"-shaped tubes brazed at the seam for increased strength and a ~15% larger heat transfer surface vs. conventional "O" tubes. Dual liquid laminar flow: The B-tube geometry creates dual flow paths inside the same space to boost cooling efficiency. Lightweight all-aluminum construction: Thinner, lighter material without sacrificing durability—ideal for performance builds. Ultra-efficient multi-louvered fins: Precisely aligned and wind-tunnel tested to maximize airflow and heat rejection for your specific application. Benefits Lower operating temperatures under load and during track sessions Improved reliability for tuned engines and motorsport environments Direct-fit design for easy installation on E39 M5 and 540i models Choose CSF for proven thermal performance and durable construction. This radiator is engineered to keep your BMW running cooler, longer, and harder.