I've run my new Syn-Wash filter for a couple days now, and am impressed with it's quicker throttle response. The 'seat-of-the-pants' feeling is much better compared to the old paper element. (The paper element was of unknown age, however, and was grey on the intake side, not clogged by any means, just a little dirty.....)
I'll have to say that engine performance is at least as good as with a new paper filter, and probably a little better. Just hoping that the filtering ability of the SynWash is good.
Since the media is synthetic, maybe it creates a static charge as air flows through, to attract dirt...?