teeheehee... sorry... Manoa's right; I went all "Winnie the Pooh" on him last week.
so, point of fact: no, I don't run it that way. When I'm working on getting the carbs right, I need the horns so I can use the Syncrometer. But for the most part they're just too loud, so I run an element-type filter, no horn. (I also think Jeff is right that these horns impede ariflow)
BUT: I would still point out that those "screen" filters, as you call them, filter down to .012" (120 microns) certainly smaller than any "dirt" you know about.
And all the while, they are proven to restrict aiflow by less than 2% as long as you are between -30df and 350df.
Now, is 120 micron filtration enough for a daily-driven car that get's oil changes every 4k miles? nah. but for a "toy" or a race car, that get a high level of maintenance, 120 micron is WAAAAY sufficient.
I'm no Boy-Racer..... but if I can't take every on-ramp at TWICE the posted limit.... I'm a total failure!