My local dealer had the UNI air filter in stock at a reasonable price so I picked one up for my Mav. No doubt the stock paper air filter is garbage, the proof is on the factory 'post' filter every time I look in the air box. If the stock paper filter worked then there wouldn't be dirt all over the 'post' foam filter. Anyhow, I've always had good luck with UNI on my dirt bikes and I'm hoping for the same on this one. The biggest drawback I see is that the filter foam is NOT removable from the rubber frame so cleaning and lubing will be more difficult and I'll be using a spray on foam filter oil. The overall 'frame' on the filter fits in the airbox perfectly and should seal up very well. I did NOT use any grease lube around the edges since I wanted to test how well the gasket seals in stock form. I cleaned and lubed the factory 'post' filter so if I do get any dust blowing by the filter I'll be able to see the proof on that filter just like I did with the factory paper filter. I plan on riding in Parker, AZ this week before the Parker 425 race and there will definitely be dust to test this thing out and I'll post up the results after. Sure hope it works as well as I expect it too, I'm not interested in more power or anything, just want good filtering to protect the engine.