I can't hear the "honk" noise over my Termi'sThe K&N filter is a direct replacement and if installed correctly won't allow dirt past the edges of the airbox.Removing the snorkles in the airbox lid will admit more air but if you haven't rejetted you most likely won't notice any real difference other than more noise from under the tank.The honk noise with the airbox lid removed drove me nuts when riding on the street.
Tom not sure if you're kidding But if you're really asking you don't "have" to have them but it is advisable for engine longevity to use them. Specially in dirty dusty places. With my VW's when I run without them (usually only for racing) I have to re-adjust the carbs. Otherwise I use filters to keep crap from going thru my carbs much less the grit going into my piston rings.If my friend's 1951 Black Lightning and 1934 SS100 don't need filters, why would I need them on my Ducatis?
No, they are daily riders. And since he restores such vehicles for a living, I think it's safe to say that he knows what he's doing.The only INTELLIGENT or sense that I can possiby find to that comment is that Tom's bike and his friend's 1951 and 1934 are just showroom, livingroom or hopefully museum pieces