CSF Top Mount Dual-Pass Charge Air Cooler - F8X M2/M3/M4

A 60% larger core size with drop-in fitment to provide better resistance to heat soak.

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Controlling heat and lowering intake air temperatures is very important when tuning the F87 M2 S55, F80 M3, and F82 M4. Higher intake air temp (IAT) means the engine computer has to dial back the boost and ignition timing to prevent detonation and knock. BMW tried to control IAT with a more advanced air-water cooling system. The problem that many tuned M3/M4s experience is the factory intercooler is just too small and extreme heat overruns the system. The low-production M4 GTS received a water injection system to further control IAT with more boost. But a simpler, bolt-on S55 intercooler upgrade is this CSF Dual-Pass design.

The CSF uses a 60% larger core for greater resistance to heat soak. More surface area = cooler overall temps for extended time. The Dual-Pass design gives the intake air more cooling capacity than the original single-pass design. And the CSF is a direct bolt-on replacement to the stock intercooler. All of the original hose connections, chargepipes, and fittings are an OEM-like fit.

The CSF top-mount uses aluminum end tanks that are stronger than the original plastic pieces on the stock cooler. They are also CFD test and cast construction for optimum flow in and out of the core. Multiple finishes are available - subtle wrinkle-black finish or unfinished if you plan on customizing the colors of your engine bay. Other finish options are also available (inquire).

Special package pricing is also available when combined with the CSF front mount heat exchanger.

  • World’s 1st cast end tank designed top mount charge-air-cooler
  • 60% increase in core size compared to the OEM cooler
  • Multiple air dividers cast into both the hot/cold side end tanks for optimized air flow
  • CFD analysis and testing completed to ensure optimal performance
  • Left/right, cross-flow, dual-pass core configuration with 2-stage water cooling (vs. OEM single-pass vertical-flow design)
  • Designed with 3D scanning / rapid prototype technology to ensure precise fitment and maximum surface area utilization.
  • “Drop-in fit” design for an easy & quick plug-and-play installation
  • Multiple finish options
  • Lifetime warranty
This part replaces BMW part number 17517846235.

Notice of Emissions Non-Compliance. This product is intended only for vehicles that may never be used, or registered or licensed for use, upon a public highway. Removing, disabling, or altering emissions equipment on a pollution-controlled road vehicle is illegal. Installing devices or software that trick, disable, or modify emissions controls and monitors on a pollution-controlled road vehicle is also illegal. This product is sold only for racing, competition, track, hobby, or other off-road use. It is not legal for installation or use in California on any pollution controlled motor vehicle. It is not legal for installation or use on any pollution controlled motor vehicle in any state, province, or jurisdiction governed by, or which has adopted, CARB or EPA regulations. Some suppliers have shipping exceptions to certain states or territories, requiring extra delivery time. We will advise you of any delays.

BMW Fitments: 

2 Series
F87 (2019+) > M2 Competition
3 Series
F80 (15-19) > M3
4 Series
F82 / F83 (2015+) > M4
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