The CSF 8321 is a high-performance auxiliary radiator for the 2021-2026 BMW G80/G81 M3 and G82/G83 M4 (all trims, including Competition, Competition xDrive, CS, and CSL) and the 2023-2026 G87 M2 with the S58 twin-turbo 3.0L inline-6. It uses a 2-row 42mm core with CSF's B-Tube Technology and seam-brazed construction for about 15 percent more heat-transfer surface, with track-spec 5mm multi-louvered fins, 100 percent all-aluminum TIG-welded tanks, and aluminum mounting pins. It has a satin black finish, OEM-style quick-connect inlet and outlet, and a detachable rock guard. It is a drop-in fit and is sold individually; each car requires two, one per side.
- Type: high-performance auxiliary radiator
- Core: 2-row 42mm, B-Tube Technology (about 15 percent more surface)
- Fins: track-spec 5mm multi-louvered
- Construction: 100 percent all-aluminum TIG-welded, aluminum mounting pins
- Engine: S58 twin-turbo 3.0L inline-6
- Finish: satin black; detachable rock guard included
- Sold: individually, two required per car
- Fitment: drop-in, no modifications
- Part number: 8321
Vehicle Applications
Direct fit on the following (S58 twin-turbo, two required per car):
- 2021 BMW M3 (G80/G81)
- 2022 BMW M3 (G80/G81)
- 2023 BMW M3 (G80/G81)
- 2024 BMW M3 (G80/G81)
- 2025 BMW M3 (G80/G81)
- 2026 BMW M3 (G80/G81)
- 2021 BMW M4 (G82/G83)
- 2022 BMW M4 (G82/G83)
- 2023 BMW M4 (G82/G83)
- 2024 BMW M4 (G82/G83)
- 2025 BMW M4 (G82/G83)
- 2026 BMW M4 (G82/G83)
- 2023 BMW M2 (G87)
- 2024 BMW M2 (G87)
- 2025 BMW M2 (G87)
- 2026 BMW M2 (G87)
FAQ
What vehicles does the CSF 8321 fit?
The 2021-2026 BMW G8X M3 and M4 (all trims) and the 2023-2026 M2, with the S58 engine.
How many are needed per car?
Two are required per vehicle, one per side. It is sold individually.
How is the core built?
A 2-row 42mm B-Tube core with about 15 percent more heat-transfer surface than OEM.
Is it a drop-in fit?
Yes. It uses OEM-style quick-connect connections and includes a detachable rock guard.
