Pressurised air boxes can be set up on dynos without to much trouble. There are a few things you have to do to the carbs to make them work but its not too hard. You can never simulate real road conditions but you can have some very good calculated guesses.

Some interesting points about pressurised air boxes is though that you wont see any gain really untill over 140mph, and once over that the gains around around 5% on peak power.

The main benifit of a ram air system is cool air. You almost also always find that the air box is lager than the stock item. Still air (the air inside the box) is theee most important thing for a race bike. This is why you will often see bikes with larger volume air boxes than petrol tanks! This is also the reason HRC list a type of air box for the NSR. Its to provide "still" air around the carbs not to keep dirt out. This is why open carbs out perform the cylinder type foam filters (there just isnt enough still air inside them).

If you ran a standard air box on a dyno and say for a giggle you got 100bhp, then swaped to a ram air box and got 105bhp, all it would show was that the stock air box was the restricting factor. Not that ram air has helped your bike.

I hope that makes sence.. but setting up a box isnt too hard if you wanna do it. One last fact. Ferrari claim a 3% increase in peak power with a pressurised system at 190mph! and how much money did they spend? It just shows how little is to be gained unless you are after every last 1/1000.

Good for poser points though so woohoo! come on everyone lets get making!
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If I have to take the carbs off once more...