I have the freak w/the pre-filters. Been in "hell-A-ish" down pours and I got soaked (gotta break down and get that rain gear one of these days) but the filters stayed dry & worked fine thanks to the pre-filters. In my opinion this mod along w/free flow pipes turns a nice bike into a great running bike. It inhales and exhales as this bike was meant to before the "tree huggers" legislated mandatory suffocation of all combustion engines!!! And now, we have to have 4-stroke Motocross bikes-what's this country coming to??? (sorry to get off on a rant)
Bill