# CSF BMW B58/B48 Front Mount Triple-Pass Heat Exchanger w/Rock Guard

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.

-   Direct Plug-and-Play Design, Including CNC Machined "Quick Connect" Inlet/Outlet Water Fittings
-   68mm 2-Row Core with CSF's B-Tube Technology (World's Largest 2-Row Core)
-   OEM CNC Machined Mounting Location Pins and Brackets
-   Core Size: 524mm Length x 478mm Height x 69mm Wide
-   Replaces OEM Part Number: 17118741830
-   No Modifications Needed to Install
-   1-Hour "Mirror Finish" Hand Polish
-   6.5mm Multi-Louvered Fin Height
-   Included Detachable Rock Guard
-   Triple-Pass Flow Design

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

## Details

- **Price:** 1009.13 CAD
- **Vendor:** CSF
- **Type:** Radiators

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 1009.13 CAD | In stock |

## Images

- Photo - Primary
- Photo - Primary
- Photo - Close Up
- Photo - out of package
- Illustration Guide
- Photo - out of package
- Logo Image

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> Source: [Standard Auto Part](https://www.standardautopart.com/products/csf-bmw-b58-b48-front-mount-triple-pass-heat-exchanger-w-rock-guard)
> Updated: 2026-07-05