The Banks Techni-Cooler replaces the factory unit and improves air density by up to 10 percent. More air density equals more oxygen for the combustion process. It achieves these improvements by increasing the interior volume by 21 percent and core surface area by 19 percent. As is the case with most heat exchangers, bigger is typically better, but there is a lot more to it than just size. The Banks unit also bests the OE design by utilizing cast aluminum side tanks that are welded directly to the core structure, unlike the factory tanks that are made from less-costly plastic that is held to the core structure by a row of folded tabs that can distort and cause leaks. The Banks design also features rounded contours that help smooth out laminar airflow both inside the tanks and on the outside, where air flows over the core structure.