the idea behind the bigger filter is that it has more surface area to catch debris. As any filter does its job, debris will slowly plug the filter element and restrict the flow of oil. In most cases, oil filters are not going to become completely plugged but we replace them as a part of preventative maintenance. If you install a larger filter in place of the factory specified one, this will ensure that even as the filter becomes plugged, it will not create much (if any) restriction to the oil flow.
The (ST8A, PH8A, etc.) will fit the 3.2/3.5s no problem. People have made complaints about being able to get the filter past the subframe and other parts, but I have had no issues with it whatsoever
Last edited by bh1992; 12-14-2011 at 06:16 PM.