CSF BMW S55 M2 Competition / M3 (F80) / M4 (F82/F83) Auxiliary Cooling Radiator

Important - sold individually: every S55-equipped F8X requires two of these auxiliary radiators (left and right side). This listing is for a single unit: if you need both sides, add a quantity of 2 to your basket.

The factory auxiliary radiators on the S55 do a decent job in stock form, but once you start adding power and pushing the car hard, their limitations start to show - and with the F8X platform now approaching a decade old, even original units on unmodified cars often suffer from damaged or clogged fins that have quietly reduced cooling capacity over time. CSF's Auxiliary Cooling Radiator is the final piece of their popular F8X cooling suite, engineered as a genuine drop-in fit for easy installation.

The larger 2-row, 42mm core uses CSF's exclusive B-Tube technology to maximise airflow and heat dissipation, mounting in the factory location and using OEM quick-connect fittings - working alongside the rest of the cooling system to reduce overall temperatures. A modular design means the same part number fits either side of the car, a genuine advantage for track use: rather than stocking a separate left and right unit, one spare covers both positions. An integrated, bolt-on rock guard protects against the well-documented risk of OEM coolers being punctured by road debris and spilling fluid.

Works with: OEM mounting location and quick-connect fittings - suitable for both manual and automatic transmission vehicles.

Why Choose This Auxiliary Radiator

• Same part fits both left and right sides - genuine cost and logistics saving, especially for spares
• Larger 2-row, 42mm core with B-Tube technology - real increase in cooling efficiency over the factory unit
• Integrated bolt-on rock guard - protects against road debris puncturing the core
• True drop-in fit - mounts in the factory location using OEM quick-connect fittings
• Worthwhile even on unmodified cars - factory units degrade with age regardless of power level
• Suitable for manual and automatic vehicles

Compatibility

• BMW F80 M3 Saloon (2014-2018, S55)
• BMW F82 M4 Coupe (2014-2020, S55)
• BMW F83 M4 Convertible (2014-2020, S55)
• BMW F87 M2 Competition/CS (2018-2020, S55)

Sold individually — order quantity 2 for a full left and right set