Airboxes have come on from when the tests were done, many sport airfilters also come with a heat shield or airbox (which was the main issue with the filters on test)
I would like a re-test to see how the new set's up's compare (b.t.w mine had a pipercross induction kit and now has a pipercross panel in o.e airbox and I'm sure the airbox set up has given it a flat spot (maybe more power but I'd prefer no flat spot!)