CSF 96-02 Toyota 4Runner (2.7/3.4L) Heavy-Duty All-Aluminum RadiatorThe 2 Row 42mm 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 increases the heat transfer by approximately 15% over regular oval welded tubes found on many other aluminum radiators. Additionally, the super efficient multi louvered fins maximize airflow through the core for the best possible performance. The end tanks are made from high grade