<ul><li><a href="http://www.autospeed.co.nz/cms/article.html?&amp;A=0663">Positive intake pressure</a></li></ul>

Julian Edgar (the author) has the same year, color UrS4 that I have and everyone over at S-Cars.Org was following that article to the letter. Bought my first Dwyer Magnehilic -10-0-+10 inH2O gauge due to that article and it's one of the coolest tools out there for airbox flowing. Keep an eye out at Ebay as they are very rare but when they do come up they seldom sell for much over $10-$15. Or they're approx $180-$200 new w/portable carrying case, a few accessories and 3 meters of rubber hose.