That filter IS way smaller than the Pro-Flow or Alba K&N and there is no way it flows as much air. I like the rest of it but put a bigger filter on it, see if a 250R K&N will fit I think those are very large. Or just buy the one that comes with the Alba kit should be about the same price but better performance.
That filter in the pic looks like the Mickey Mouse little filter on my Z400 that came with the Pro-Flow.
As soon as I get back from dumont this weekend my head will be coming off and getting ported, then this little airfilter is probably not gonna cut it anymore, you should produce these kits with a larger filter and sell them for $100 bucks not $150, you can make your own like I did, for a few bucks, or buy one from ESR for $65 bucks that comes with a larger filter.