Would it make sense/be possible to change the banjo bolt on the turbo end out for something like the one in the link below that would allow for a pressure sensor. This way you could tell if the pressure dropped in the oil line due to blockage in the filter?
http://www.namotorsports.net/detail.cfm/part_cd/NPCON.017/xref/base
I am looking to buy a used 2005 OB XT but these forums have me worried.