Koyo Performance Aluminium Radiator for BMW E36 Diagram Koyo Performance Aluminium Radiator for BMW E36 Description Ideal for use both on and off the track this Koyo Performance aluminium radiator will considerably improve your engine cooling. Made from aviation grade aluminium TIG welded and with a high quality polished finish it goes directly in place of your existing radiator without any modification : using the same mounting brackets stock fans and/or shrouds sensors drain plugs etc. N-Flo Technology Koyo offer their innovative N-Flo technology fitting their radiators with N shaped internal partitions. This exclusive design allows the coolant to flow through the radiator for longer and ensures effective cooling across the whole surface (unlike standard radiators where the coolant usually flows diagonally). N-Flo technology combined with the high thermal conductivity of the aluminium guarantees up to 50% better cooling efficiency than stock lower operating temperatures and improved engine reliability. Replaces the following OEM part numbers : 17111469179 17111728908 17111707929 17111723694 17111723784