CSF 18-23 Subaru Crosstrek / 17-22 Impreza High-Performance All-RadiatorBrand CSF Part Number 7216 Category Cooling Radiators Condition Brand New Original Manufacturer Packaging The 42mm 2 Row aluminum core not only increases the fluid capacity of the radiator, but also improves the cores ability to dissipate heat. CSF's Exclusive B Tube Technology improves heat transfer by approximately 15% over regular oval welded tubes. In addition, the super efficient multi louvered fins maximize airflow through the core for the best