I posted the link to the Pit-Lane forum in "CR 480 carb upgrades" thread. It has a few pics of the 24/7 inlet, I mentioned before but Roland Holzer from Modena kart engines has a commercial version of it. Frits has been working with Roland for a while.
What Jan Thiel says is backed by 25 riders and 26 or 27 constructors titles and 500 gp wins, if Jan said it did or didn't work you can have your house on that.