The CSF High-Performance Auxiliary Radiator is a satin black radiator for BMW S55 applications including the F80 M3, F82/F83 M4 and F87 M2 Competition.
Its modular design uses interchangeable fittings and plugs for installation on either side. The right-side radiator serves the charge-air cooling system; the left-side radiator serves the engine cooling system.
Key Features
- Two-row 42 mm core with CSF B-Tube technology
- 2026 update features 5 mm tall multi-louvred fins
- All-aluminium TIG-welded construction
- OEM-style quick-connect inlet and outlet connections
- Drop-in installation without modifications
- Individually leak and pressure tested
Specifications
- Core: 2-row, 42 mm (OEM 1-row, 41 mm)
- Cooling tubes: 27 (OEM 24)
- Fin rows: 28 (OEM 25)
- Size gain: About 7% more core size and 10% more tank volume than OEM
Important Sold individually with a detachable rock guard. All listed applications use two auxiliary radiators, although each side can be replaced separately.
Important OEM reference numbers: 17112284603 and 17112284604.
