I don't care what any magazine, especially a big west coast mag driven by advertising dollars, says. K&N type gauze filter is a bad deal for a dirt bike. Its even a bad deal for a sport bike unless it lives on the track(clean). Been there, done that. Drawn my own conclusions that are backed up by many, using science not ad $$. I suspect GG knows this as well, hence the noted use of a foam filter. If by chance they do come with a gauze filter I can guarantee that mine will never be ridden with it.