CSF Racing Charge Air Cooler KitBMW F9X M5 M8 Twin Charge Air Cooler Set The F90 M5 & F9X M8 are truly worthy successors to the F1X platform. BMW's S63 Twin Turbo V8 is a tried and true power plant capable of big numbers. Like most turbo engines, cranking up the boost for those big gains creates a lot more heat. Fortunately for F9X owners, CSF is here to help keep those Intake Air Temperatures (IATs) down and your power up. CSF used CFD analysis and testing to create the largest