So I have been giving some thought over the weekend to why stock location turbos on Subarus always deliver relatively mediocre results. Why is it that turbos that routinely deliver 300wkw+ when installed in a rotated/twisted setup (i.e. GT/GTX3071R) get more like 250-260wkw when installed in the stock location?   I believe the answer is all in the turbine housing. In order to retain "stock" fitment, the turbo cannot alter the relationship between the location of the uppipe flange