BMW B38/B46/B48/B58 High Performance Heat Exchanger (Black or Silver)

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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. This new high performance 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.

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.


  • Core size: 524mm Length x 478mm Height x 69mm Wide
  • 68mm 2-row core with 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
  • Comes in black or silver finish 

What’s Included?

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

Fitment chart

OEM# 17118741830

Supercedes OEM# 17118625430; 17118482625

Year Model Sub-Model Chassis Code Engine Code
15-18 120i 5 doors F20 B48
15-18 125i 5 doors F20 B48
15-18 M140i(X) 5 doors F20 B58
16-18 218i Coupe F22 B38
15-18 220i Coupe F22 B48
15-18 230i(X) Coupe F22 B48/B46
15-18 M240i(X) Coupe F22 B58
16-18 218i Convertible F23 B38
15-18 220i Convertible F23 B48
15-18 230i(X) Converitble F23 B48/B46
15-18 M240i(X) Converitble F23 B58
14-18 320i(X) Sedan F30 B48
14-18 330e Sedan F30 B48
14-18 330i(X) Sedan F30 B48
14-18 340i(X) Sedan F30 B48
14-18 320i(X) Touring F31 B48
14-18 330i(X) Touring F31 B48/B46
14-18 340i(X) Touring F31 B58
15-18 320i(X) Gran Tourismo F34 GT B48
15-18 330i(X) Gran Tourismo F34 GT B48/B46
15-18 340i(X) Gran Tourismo F34 GT B58
15-18 420i(X) Coupe F32 B48
15-18 430i(X) Coupe F32 B48/B46
15-18 440i(X) Coupe F32 B58
15-18 420i(X) Convertible F33 B48
15-18 430i(X) Convertible F33 B48/B46
15-18 440i(X) Convertible F33 B58
15-18 420i(X) Gran Coupe F36 Gran Coupe B48
15-18 430i(X) Gran Coupe F36 Gran Coupe B48/B46
15-18 440i(X) Gran Coupe F36 Gran Coupe B58

Product information