CSF Radiator for BMW 1M/135i/335i 2-Row Aluminum Core with B-Tube Techno

CSF High-Performance Radiator for BMW 1M / 135i / 335i — 2-Row Aluminum Core with B-Tube Technology Upgrade cooling performance with CSF’s precision-engineered all-aluminum radiator. Designed for street and track, this direct-fit unit delivers improved heat rejection for high-horsepower builds and motorsports use. Key Features 2-row aluminum core for balanced airflow and thermal capacity B-Tube Technology — uniquely shaped tubes brazed at the seam to increase strength and surface area (~15% more than traditional O-tubes) Dual liquid laminar flow effect from the B-tube design for faster heat transfer Precision multi-louvered fins engineered and wind-tunnel tested for maximum airflow and heat rejection Lightweight, durable construction using thinner aluminum for superior efficiency without sacrificing strength Why Choose CSF With over five decades of radiator manufacturing experience, CSF combines advanced materials and research-driven design to keep your BMW running cooler under extreme conditions. This radiator is an excellent upgrade for enthusiasts seeking reliable, high-efficiency cooling. Fitment: BMW 1M, 135i, 335i. Direct-fit replacement engineered for OEM mounting and performance.