Sermons of Bob Hoover is a good mention.
You're not going to get much 'scooping' action inside the wheelwell. Keep in mind that the cooling fan is interposed between the engine bay plenum and the underside. IIRC it's 1500cfm of
pumped positive pressure air. Just having an adequately sized opening is all that's needed.
http://justacarguy.blogspot.com/2017...-creation.html
I'd seen this one on thesamba, JACG points to the build thread.