CSF Aux Radiator Upgrade - G42 M240i, G20 M340i, G22/G26 M440i, G29 M40i, Supra

CSF Aux Radiator Upgrade - G42 M240i, G20 M340i, G22/G26 M440i, G29 M40i, Supra

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This is a aux radiator upgrade for G42, G20 M340i, G22 M440i, G29 Z4 M40i, and Supra A90 and replaces BMW part #17118672237. This is the small radiator located in the left or right side bumper and provides additional coolant capacity and cooling surface area.

The aluminum construction is far stronger and more reliable than the factory piece that uses plastic end tanks. With the tight space of the engine bay maximizing surface cooling is crucial and CSF has a proven winner in design and materials.

CSF remote radiator features:
  • 2-row 42mm core (dual core) featuring CSF’s exclusive B-tube technology
  • Core features an ultra-efficient multi-louvered fin design for maximum surface area contact
  • CNC machined, OEM style “quick-connect” inlet/outlet connections
  • CNC machined, OEM style mounting brackets & fittings for superb fit and durability
  • Includes removable aluminum rock guard
  • Black thermal coating
  • 2-year warranty
Fits both left or right side but is sold per radiator.

All CSF radiators receive design and development in the USA with additional wind tunnel, vibration, thermal cycle, burst pressure, and salt spray testing done at their production facilities in Southeast Asia. During manufacturing, radiators are individually tested for leaks and receive a 30-point inspection prior to shipping. This part is a much higher level of quality than typical Chinese factory parts. CSF is an OE supplier to several manufacturers as well as providing private-label products for other radiator brands. CSF radiators have a two year warranty.

BMW Fitments:
2 Series
G42 / G43 (2022+) > M240i xDrive
3 Series
G20 (2019+) > M340i
G20 (2019+) > M340i xDrive
4 Series
G22 / G23 (2021+) > M440i
G22 / G23 (2021+) > M440i xDrive
4 Series
G26 (2022+) > M440i xDrive Gran Coupe
Z Series
G29 Z4 (2019+) > Z4 M40i
G29 Z4 (2019+) > Z4 sDrive30i
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