CSF BMW M3 E46 Triple Pass High-Performance Radiator

Engine heat is the enemy when pushing an E46 M3 hard, and CSF's Triple-Pass High-Performance Radiator was built specifically to keep it in check. Rather than a conventional single-pass design, coolant is routed across the core three times before exiting the radiator, for the lowest achievable outlet temperatures - a genuine upgrade for both high-horsepower builds and race cars needing added cooling margin in demanding motorsport environments.

The 2-row, 42mm core features CSF's exclusive B-Tube technology - rather than a regular oval "O"-shaped tube, CSF uses a specially engineered "B"-shaped tube, carefully formed and brazed over the seam. This design increases heat transfer surface area by approximately 15% over regular tubes, delivering the efficiency of two smaller tubes within the same space as one large tube, while allowing for thinner, lighter, more thermally efficient aluminium. Paired with ultra-efficient multi-louvered fins, precisely aligned and wind-tunnel tested for each application, along with CNC-machined quick-connect fittings and brackets, the result is a true drop-in fit requiring no modifications to install - each unit hand-polished to a mirror finish.

Why Choose This Radiator

• Triple-pass flow design - coolant crosses the core three times for the lowest possible outlet temperatures
• CSF's exclusive B-Tube core technology - ~15% more heat transfer surface area than regular tubes
• Ultra-efficient multi-louvered fins - wind-tunnel tested for maximum heat rejection per application
• CNC-machined brackets and quick-connect fittings - precise, stock-like fitment and long-term durability
• Hand-polished mirror finish - genuine show-car quality alongside the performance upgrade
• True drop-in fit - no cutting or modification required, same-as-stock installation

Compatibility

• BMW E46 M3 (2000-2006, S54)

Part Number

• CSF #7058, replaces OEM part 17102228941