OK, my google-fu is failing me. Somewhere in the dark past of NASIOC, there is a thread about aerodynamics. Contained within that thread are some posts by a guy who lived near a scenic overlook where the wind often blew 70-90mph. He had numerous pictures of yarn taped all over the car showing where the flow was attached vs turbulent. I can find several threads on Impreza aero, but none of them have the posts and pics I'm looking for.
Does anyone remember what I'm talking about and have it bookmarked?