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I'm not sure I follow completely. You can run an independent dry sump for the turbo if you wish... it's inefficient and a waste of space but it's not going to kill you. You should run it through a small cooler, but you may be able to make use of the oil/water cooler used on the 2JZ, 3S or 5S to help simplify things and to avoid having to worry about the placement of another rail cooler.

I do not understand what you're saying about the stock cooler. If you run a separate pump for the turbo then you can not mate it to the stock system. The stock oil cooler's drain sits at (and often below) the oil level... If you drain the turbo's oil there and it gets covered pressure will backup and build in the turbo often killing the oil seals right then and there.

And I have no idea what STS' turbo kits have to do with any of this.


EDIT: I suppose I should explain that the oil to water cooler is a sandwich plate adapter which mounts to the oil filter boss on the block, is screwed in place and the oil filter mounts to it. Google 2JZ oil cooler or MR2 oil cooler and you're sure to find photos.