The CSF 8258 is a high-performance auxiliary radiator for the 2015-2021 BMW F80 M3, F82 and F83 M4 (including M4 CS and GTS), and F87 M2 Competition and M2 CS with the S55 twin-turbo 3.0L inline-6. It uses a 2-row 42mm core with CSF's B-Tube Technology and track-spec multi-louvered fins, with about 10 percent more tank volume and 6.4 percent more core than the OEM unit. It is a drop-in fit with a satin black finish, OEM quick-connect fittings, and a detachable rock guard. It is sold individually and works on either the left or right side; every application requires two auxiliary radiators.
- Type: high-performance auxiliary radiator
- Core: 2-row, 42mm, B-Tube Technology
- Fins: track-spec, multi-louvered
- Volume: about 10 percent more tank volume, 6.4 percent more core than OEM
- Engine: S55 twin-turbo 3.0L inline-6
- Fits either left or right side; sold individually, two required per car
- Included: detachable rock guard
- Finish: satin black
- Part number: 8258
Vehicle Applications
Direct fit on the following (S55 twin-turbo):
- 2015 BMW M3 (F80)
- 2016 BMW M3 (F80)
- 2017 BMW M3 (F80)
- 2018 BMW M3 (F80)
- 2015 BMW M4 (F82/F83)
- 2016 BMW M4 (F82/F83)
- 2017 BMW M4 (F82/F83)
- 2018 BMW M4 (F82/F83)
- 2019 BMW M4 (F82/F83)
- 2020 BMW M4 (F82/F83)
- 2019 BMW M2 (F87)
- 2020 BMW M2 (F87)
- 2021 BMW M2 (F87)
FAQ
What vehicles does the CSF 8258 fit?
The 2015-2021 BMW F80 M3, F82/F83 M4 (incl. CS and GTS), and F87 M2 Competition and M2 CS with the S55 engine.
How many are needed per car?
Two auxiliary radiators are required per vehicle. It is sold individually.
Does it fit the left or right side?
It is a modular design that works on either the left or right side.
How many rows is the core?
A 2-row 42mm core with CSF's B-Tube Technology.
