Review on Optimized Performance Filter for KN 303 Motorcycle Powersports by Chris Owens

Overall the only reason I bought this filter is the nut welded on the top . This makes removing my 2013 Kawasaki ZX6R MUCH easier than the factory filter. They aren't cheap either. Be careful with them though, if you don't have the exact size to remove them, the nut will end up being rounded and it will be very difficult to remove. It also seems to filter well (which is probably the most important aspect of it). I would definitely recommend it to anyone who wants a smoother oil change.