CSF Radiator for Audi A3/S3 2-Row Core All-Aluminum B-Tube Technology

CSF Radiator for Audi A3/S3 — 2-Row All-Aluminum with B-Tube Technology Upgrade cooling performance for your Audi A3/S3 with CSF’s high-performance, all-aluminum radiator. Backed by over five decades of radiator expertise, this 2-row core unit is engineered for street driving, high-horsepower builds, and track use. B-Tube Technology: Unique B-shaped tubes are seam-brazed for strength, allowing thinner, lighter aluminum with ~15% greater heat transfer surface than conventional “O” tubes. Dual liquid laminar flow: B-tubes create two smaller flow paths within the same space, improving coolant distribution and thermal efficiency. Precision multi-louvered fins: Optimized fin geometry and alignment maximize airflow and heat rejection — validated in CSF wind-tunnel testing. Durable all-aluminum construction: Corrosion-resistant, lightweight, and built to withstand motorsports conditions. This CSF radiator is a direct-fit performance upgrade for Audi A3/S3 owners seeking reliable temperature control under increased loads. Ideal for tuned engines, track days, and everyday driving where extra cooling margin matters. Benefits: Lower operating temps, improved consistency, reduced risk of overheating, and enhanced durability.