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. 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.

This Part Fits:

Year	Make	Model	Submodel
2017-2021	BMW	230i	Base
2017-2021	BMW	230i xDrive	Base
2016,2018	BMW	330e	Base
2017	BMW	330e	iPerformance
2017-2018	BMW	330i	Base
2017-2018	BMW	330i GT xDrive	Base
2017-2019	BMW	330i xDrive	Base
2016-2018	BMW	340i	Base
2017-2019	BMW	340i GT xDrive	Base
2016-2018	BMW	340i xDrive	Base
2017-2020	BMW	430i	Base
2017-2020	BMW	430i xDrive	Base
2017-2020	BMW	430i xDrive Gran Coupe	Base
2017-2020	BMW	440i	Base
2017-2020	BMW	440i Gran Coupe	Base
2017-2020	BMW	440i xDrive	Base
2017-2020	BMW	440i xDrive Gran Coupe	Base
2017-2021	BMW	M240i	Base
2017-2021	BMW	M240i xDrive	Base