CSF Triple-Pass Heat Exchanger, BMW F3X/F2X B58/B48 (+Rock Guard)

BMW F3X and F2X B58 and B48 heat exchanger upgrade for higher performance use

The CSF Triple-Pass Heat Exchanger with Rock Guard is designed for BMW F-series B58 and B48 models when the factory cooling system starts becoming a limitation. Once power levels go up, charge air cooling becomes a serious part of keeping the car performing consistently, and this is exactly the kind of upgrade that helps keep temperatures under control. It makes especially good sense for tuned cars and upgraded turbo setups.

The original OEM B58 heat exchanger is a 1-row unit with a thickness of 27 mm, while CSF uses a massive 2-row 68 mm core with its exclusive B-Tube technology. Despite the significantly larger core, the unit is engineered to fit within the factory cooling system housing without unnecessary drama.

One of the biggest highlights here is the triple-pass flow design. Water flows through the heat exchanger three times before exiting, which helps bring outlet temperatures down as much as possible. That gives it a real advantage over the OEM design and many other alternatives that still rely on a single-pass structure.

The included rock guard adds extra protection for the core against stones and road debris, which is never a bad thing on a car that actually gets driven properly. The Satin Black finish keeps the look clean and OEM plus, so the finished setup looks right at home behind the bumper.

• 2-row 68 mm high performance core
• CSF B-Tube technology for improved heat transfer
• Triple-pass flow design for more efficient cooling
• Fits within the OEM housing without modifications
• Includes rock guard for added core protection
• Satin Black finish with an OEM plus appearance
• Excellent upgrade for tuned and turbo upgraded vehicles

OE reference numbers: BMW 17118741830, 17 11 8 741 830, 17-11-8-741-830

Example compatible models:
BMW 230i 2017-2021
BMW 230i xDrive 2017-2021
BMW 330e 2016-2018
BMW 330i 2017-2018
BMW 330i GT xDrive 2017-2018
BMW 330i xDrive 2017-2019
BMW 340i 2016-2018
BMW 340i GT xDrive 2017-2019
BMW 340i xDrive 2016-2018
BMW 430i 2017-2020
BMW 430i xDrive 2017-2020
BMW 430i xDrive Gran Coupe 2017-2020
BMW 440i 2017-2020
BMW 440i Gran Coupe 2017-2020
BMW 440i xDrive 2017-2020
BMW 440i xDrive Gran Coupe 2017-2020
BMW M240i 2017-2021
BMW M240i xDrive 2017-2021