CSF Race Triple Pass Aluminium Radiator for BMW E46 M3 (20002006) B‑Tube High‑Efficiency Performance Cooling Upgrade for Track & Road

Ultimate Cooling For BMW M3 E46 Track And Fast Road

Take control of coolant temperatures on your BMW M3 E46 with CSF’s triple-pass alloy performance heat exchanger. Built for hard use on circuit and confidence on the road, this motorsport-grade cooler uses CSF’s split B-tube core and high-density louvred fins to move heat out quickly and keep the S54 running consistently in demanding conditions.

Why Enthusiasts Choose This CSF Cooler

• Triple-pass flow path increases time in the core for superior heat rejection and rock-steady temperature control during sustained hard driving.
• Seam-brazed B-shaped tubes create a split internal profile that boosts effective surface area by around 15 percent compared to conventional oval tubes, improving efficiency without unnecessary weight.
• High-efficiency, multi-louvred fin pack is application tuned to maximise airflow through the core and shed heat fast at speed or in traffic.
• All-aluminium construction for durability and dependable thermal performance under repeated heat cycles.
• Proven solution for track days, time attack, drifting and spirited B-road use where heat soak is the enemy.

Real-World Results You Can Trust

We have installed and run this CSF triple-pass unit on our own builds and customer E46 M3s with excellent results. Feedback has been consistently positive, with cooler, more stable temps and improved confidence lap after lap.

Built For The BMW M3 E46 Platform

Designed specifically for the BMW M3 E46 model years 2000 to 2006, this high-performance alloy rad is a favourite upgrade for owners who drive hard and want reliable thermal management without compromise.

Key Technical Highlights

• CSF split B-tube core technology for enhanced heat transfer and strength.
• High fin density and precision louvre geometry to optimise airflow and cooling efficiency.
• Triple-pass core layout for maximum coolant dwell time and improved heat shedding.
• Motorsport-grade aluminium build engineered for repeated high-load use.

Fitting And Support

Professional installation available at MJ Modifications in Warwickshire. Request a fitting quote at info@mjmodifications.co.uk.

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Ready to banish heat soak and drive harder for longer? Order your CSF triple-pass alloy cooler today and give your E46 M3 the thermal headroom it deserves.