CSF Racing Twin Charge Air Cooler KitBMW F1X M5 & M6 Twin Charge Air Cooler Set Crinkle Black Finish The S63 4. 4L Twin Turbo V8 in the BMW F1X M5 M6 is an absolute monster that responds incredibly well to bolt on upgrades, larger turbos, and performance tuning. Tuners quickly found that increasing power on the S63 pushed charge air temperatures past the OEM Charge Air Coolers' limits resulting in dangerously high Intake Air Temperatures (IATs). Pure turbos approached CSF to develop a
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