What ever happen to the good ole days when we never ran a filter at all. Just a make shift velocity tube. Sometimes I would kill the engine by putting the palm of my hand over the opening. I put a lot of miles on those two bikes and never thought a thing about it. A little grit kept those rings seated and those jugs scribed clean. Lol
I know it's not the best for performance, but I kind of like the stock filter and air intake system on the rocket. It makes sense to pull all that air through those ports under the seat. It helps keep that heat from the engine from migrating up to the seat and overheating your butt on a hot day. It looks like a great design idea to me.