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

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

Please contact us via the contact page form to start a return or exchange. The return/exchange process must be started within 1 week of delivery, after 1 week we will not be able to issue a refund/exchange. A 20% restocking fee will be applied to any return once the order has been shipped. For any questions regarding returns or exchanges feel free to contact us at sales@horizonmotorsport.com or reach out to us via the contact form and we would be happy to help.

You can find additional details on our return and exchange policy here.




Horizon Motorsport has one goal: to make our clients happy. We aim to provide the highest level of customer service and the highest caliber parts, all at the most competitive prices. Have a question or concern about a product we sell? Send us an email at sales@horizonmotorsport.com.


Every piece of carbon fiber that leaves our location in Los Angeles, CA is quality checked extensively prior to shipment. Every piece is backed up by our fitment and finish guarantee.


At Horizon Motorsport our mission is to provide unparalleled customer service. As a small business we pride ourselves on creating long lasting relationships with our customers who know that they can count on us for any of their BMW needs.


Horizon Motorsport was founded in 2019 in Los Angeles, CA by fellow BMW enthusiasts. We have experience with nearly all makes and models and have been actively involved in the Southern California BMW scene for over 3 years. Because of our unique insight into the BMW community, we choose to carry only the highest quality parts from the highest quality brands on the market.