The factory Subaru oil cooler kits (as used on spec C's etc etc) replace the heat exchanger under the oil filter, my initial thoughts are there is a reason those ports are not used on the oil pump although I confess to not knowing why nor having ever used them before.
Speaking of oil pumps, Scott concidering oiling issues have plagued you I think you should contact Japanparts.com regarding the 12mm pump they have been importing. I tested one on one of our cars and found the increase in oil pressure and ability to maintain more as the rpms raised a worthwhile benifit. The pump cost us $165 shipped from Japan and we simply shimmed the relief valve as we have always.
As for the coolant lines we typically route them back to themselves, originally we tried capping things and such on the L and all we did is create a nightmare as far as bleeding and maintaining the system goes, we also tried some other funky stuff so hard to point any fingers as why the whole setup we tested sucked so badly.
If I can help any further drop me a line offline and I'll help in anyway I can.
Mike
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