S55 Front Mount Heat Exchanger - F80 M3/F82 F83 M4/F87 M2CS55 Front Mount Heat Exchanger BMW F80 M3 F82F83 M4 F87 M2 Competition Increased Cooling Capacity for Consistent Performance The factory S55 cooling system is one of the biggest limitations when pushing these cars hardwhether on the street, track, or aggressive canyon driving. The S55 Front Mount Heat Exchanger is designed to significantly improve charge air cooling efficiency, reduce heat soak, and maintain consistent power under sustained load. By