CSF B58 HIGH-PERFORMANCE HEAT EXCHANGER - F3X 340i | G2X M340i | F3X 440i | F2X M240i

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B58 High-Performance Heat Exchanger (CSF #8131/8131B)


***Product Update October 2019 Production*** CSF’s pursuit of cooling perfection continues with improvements to The Ultimate BMW B58 High Performance Heat Exchanger. As of October 2019, CSF has released a new and improved “Version 2.0” of the BMW B58 Heat Exchanger. Improvements include the following Three (3) key updates:

Upgraded inlet/outlet design with new tapered entry and exit points from end tanks, resulting in optimized water flow and increased performance (matches OEM spec).*
After extensive wind-tunnel, dynamometer (rolling-road test), and field testing, CSF engineers have improved the core spec from Version 1’s 68mm 2-row core with 8mm fin height to Version 2’s Ultra-efficient 42mm 2-row core, with CSF’s B-tube technology, and 6.5mm multi-louvered fin height. *
Increase of 15% more cooling tubes used in the core vs. V1 design for better surface area contact and heat dissipation.
Results in optimized airflow through the heat exchanger core and into other cooling system components for maximum performance of the entire cooling system. (Especially critical if installed in an X-Drive model with transmission oil cooler placed in front of heat exchanger)
CSF V2 design: 2-row 42mm core vs. OEM design: 1-row 26mm core. ~62% increase in core fluid capacity
Now includes hardware mounting kit* for applications that have a factory transmission oil cooler mounted in front of the heat exchanger (X-Drive models)
(OEM #17118625431).


CSF upgraded the inlet/outlet design and improved the core specifications for better air-flow, water-flow, and improved cooling system performance. These updated features result in further lowering Intake Air Temperatures (IATs) of the air-to-water in-manifold charge cooler air cooler system for maximum performance.
Hardware mounting kit for applications that have transmission oil coolers (X-Drive models)

The included hardware mounting kit is for applications that have a factory transmission oil cooler (OEM #17118625431).

Example of factory transmission oil cooler (OEM #17118625431) mounted along with included rock guard.
Core size: 524mm Length x 478mm Height x 69mm Wide
68mm 2-row core with CSF’s B-tube technology (world’s largest 2-row core)
6.5 mm multi-louvered fin height
Triple-pass flow design
Included / detachable rock guard
OEM CNC Machined mounting location pins and brackets
Direct Plug and Play, including CNC, machined “Quick-connect” inlet/outlet water fittings
No Modifications needed to install.
For a more in depth look please check out the CSF B58 Heat Exchanger Press Release
OEM #: 17118741830