Jeg fant jeg fant.... her: http://www.billzilla.org/4agstock2.htm
INLET MANIFOLD - 20 Valve
Very good indeed - They have a single throttle butterfly for each cylinder, and so are about as good as a very good racing inlet system.
Hot property, they are!
One slight problem though, if you want to fit one to your 16v - They won't bolt on and so require an adaptor, and more importantly they have ZERO inlet manifold vacuum, so the computer won't work ... An aftermarket add-on only for the 16v's.
(That being said, I've read a few reports from various people that say that they've gotten the stock 16v computer & 20v inlet manifold to work together okay)