In the last few tests of OEM nissan filters being cut open they were sub par materials like cardboard ends. They were almost identical to FRAM. Even the supertech walmart filters were superior which I use on my G20. Wix filters seem to be very popular with the SR community and they are made extremely well.
Here is a thread with pics. It's from another forum so if this is frowned upon feel free edit this mods.
http://www.myg37.com/forums/en....html