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This is Koyo’s N-Flo technology which allows for a double or triple pass radiator. N-Flo technology is available on cars that are known to have limited airflow to the radiator. Unless noted otherwise, all Koyo N-Flo Aluminum Radiators are Nocolok brazed, designed as a factory fit, direct bolt in with no engine modifications necessary, and retain mounts for the OEM fan shrouds and fans.