My filter is like that one on the photo and I have d16 rubber intake hose.
I think that I don't have sharp edges but as you said the open air system is the matter for the annoying noise at mid revs.
(I like the producing noise at the high revs...
it's like one step before arming the vtec
)
So what you suggest to go dc2 airbox?
Will it reduce the noise because of airbox system? (it will not have the resonator)
But what you say about the EK4 airbox without resonator, is it worth the money?