[Xist]

Originally Posted by California98Civic

A study by somebody named Hussain Ali at a conference on aero at Coventry found that a 4" (100mm) rear box cavity could yield a modest gain. But a diffuser at a slight angle (2%) was also needed. I tested a box cavity, without the diffuser, and had inconclusive results: http://ecomodder.com/forum/showthrea...tml#post376489

It looks like that refers to pages eleven and twelve of this:

http://www2.warwick.ac.uk/fac/sci/wm...ionvehicle.pdf