The Ultimate BMW B58 High-Performance Heat Exchanger

CSF COOLS the F-Series B58 engine

***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).

*World Exclusive

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.

The BMW F-series B58 engine is found in a wide array of BMW vehicles (M140i, M240i, 340i, 440i). The motor is similar to the S55 engine found in the latest generation F8x M3/M4 (and new M2 competition) in that it has an indirect water-to-air charge cooling system with a supplemental front mount heat exchanger to cool the water that circulates through the charge cooler. However, unlike the S55 motor, the BMW B58 charge cooler is built into the plastic intake manifold housing. In the meantime of continued development of its high-performance manifold charge cooler, CSF has first released their new BMW B58 heat exchanger for BMW F-Series vehicles. CSF’s new high performance B58 heat exchanger drastically reduces water temperatures in the charge cooling cycle, which in turn reduces and stabilizes the intake air temperatures of the engine.  With many unique features, included accessories, and of course, industry-leading performance, it’s without a doubt the best option on the market for every consumer whether it be for a daily driver or a high-performance race car.

CSF’s new BMW B58 high performance heat exchanger in mirror polished finish (CSF #8131)

Through several prototypes, CSF has come up with a winning design, and has been able to fit the absolute largest & most efficient cooler into the vehicle.

Designed to fill the entire area in front of the cooling system housing and underneath the OEM X-brace. Includes detachable rock guard for extra protection. 

The original OEM B58 heat exchanger is a 1-row unit that is 27mm thick. In comparison, CSF has used its industry exclusive world’s largest 2-row core (68mm) with CSF’s B-Tube technology. A unique tank design allows the larger CSF core to still fit into the OEM cooling system housing.

The OEM heat exchanger is confined within the plastic cooling system housing.

The thicker CSF 68mm core protrudes out of the plastic cooling system housing and installs with no modifications.

Another critical feature of the CSF BMW B58 high-performance heat exchanger is its unique triple-pass flow design. The water traveling through the upgraded heat exchanger flows through the radiator three times before exiting the cooler and flowing back into the manifold charge cooler. This ensures that the outlet water temperature of the heat exchanger is the absolute lowest it can be. The OEM design, as well as more expensive aftermarket designs, all have single-pass flow structures.

3x the cooling compared to the OEM! Exclusively from CSF

Take a look at the comparison graph done by our R&D partner and preferred dealer, Studio RSR.

You can see from the data in the chart how quickly intake air temperatures (IAT ℉) start to rise when using the OEM heat exchanger. Through only one gear pull in 4th gear at wide open throttle (WOT), IAT’s shot up by 15 degrees ℉ and will continue to climb to the point of heat soak when using the OEM heat exchanger. In comparison, the high-performance BMW B58 heat exchanger from CSF keeps temperatures stable and consistent at ~95 ℉. This is due to the three key design characteristics of the CSF unit; increased capacity, triple-pass design, and CSF’s ultra-efficient B-tube core technology. 

CSF’s high performance / upgraded heat exchanger for BMW F-series B58 engines comes standard with a detachable rock guard and is also available in 2 finishes. 

  • Semi-Gloss Black – CSF# 8131B
  • Polished – CSF# 8131

Engine side of the CSF BMW B58 heat exchanger for F-series vehicles. Shown in black (#8131B) – take notice of the 100% TIG welded construction and CNC machined brackets and fittings.

As the 3.0 Liter B58B30M0 turbo engine platform continues to be developed by the high performance industry and more power is extracted from the engine, CSF’s high performance heat exchanger for the BMW B58 engine will be a critical component to keeping the vehicle charge air cool, and out of limp mode. The CSF BMW B58 upgraded heat exchanger for F-series vehicles will be especially important to install in upgraded turbo applications and/or vehicles running high performance tuning software. 

CSF BMW High Performance BMW B58 Heat Exchanger


  • 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.

What’s Included?

  • CSF BMW High Performance B58 Heat Exchanger
  • Hardware Kit
  • Detachable rock guard

OEM Part Number

  • #17118741830

CSF Part Numbers

  • Semi-Gloss Black – CSF# 8131B
  • Polished – CSF# 8131


Verified Application Fitment

  • 15-18 BMW 120i, 125i, M140i(x) (F20)
  • 15-18 BMW 120i, 125i, M140i(x) (F21)
  • 15-18 BMW 220i, 230i(x), M240i(x) (F22)
  • 15-18 BMW 220i, 230i(x), M240i(x) (F23)
  • 14-18 BMW 320i(x), 330e, 330i(x), 340i(x) (F30)
  • 14-18 BMW 320i(x), 330i(x), 340i(x) (F31)
  • 15-18 BMW 320i(x) GT, 330i(x) GT, 340i(x) GT (F34)
  • 15-18 420i(x), 430i(x), 440i(x) (F32)
  • 15-18 BMW 420i, 430i(x), 440i(x) (F33)
  • 15-18 BMW 420i(x), 430i(x), 440i(x) Gran Coupe (F36)

CSF BMW B58 high performance in semi-gloss black removable rock guard installed (CSF #8131B)

DIY Installation of CSF’s B58 Heat Exchanger
Test Data Showing a Consistent 17° F Reduction in Intake Air Temperatures

13 thoughts on “The Ultimate BMW B58 High-Performance Heat Exchanger

  1. Any chance for a G01/G02 version?

    Can you ice this heat exchanger to get the coolant to less than ambient temps for 1/4 mile runs?
    (An attachment to hold ice bags on the front would be a nice bonus…)

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