CSF BMW M3/M4/M2 Competition Race Top Mount Charge Cooler In Crinkle Black Finish (F80/F82/F83/F87)CSF Radiators BMW S55 Top Mount Charge Cooler for F80 M3, F82 M4 and F87 M2 Competition keeps the charge temperatures consistently cool which is key to the S55 for performance. CSF's top mound charge cooler helps keep these temps consistently cooler, especially under hard use compared to the OEM item. PRODUCT SPECIFICATION Multiple air dividers cast into both the hot cold side end tanks for optimized airflow through the custom designed CSF liquid to