Mark, I'm not running an oil cooler other than the stock cooler/heater/whatever at the filter. Thousands of WRXs seem to be fine driving streets in lots of conditions, so I don't know why I would need any other oil cooler.

I was stupid to install 2 fans in my intercooler plenum, and will remove them. I put them in thinking I'd need them to move air when stopped or in stop-&-go traffic. But, at those times, the turbo is not heating the intake air and the engine is sucking ambient air through the intercooler, so having the fans push ambient air is useless. When my 818C is moving, I've got plenty of ambient air coming through the roof and side ducts to cool the intercooler.

Regarding appearance, I like the suggestion by ben1272. He said to make 2 narrow plenums, each leading from the roof ducts back to the intercooler. They would look sort of like the intakes on bigger engines. Good idea for another project.