Of course there is a reason to keep it 3 inch to the turbo mouth, less restriction... I match my intakes to the actual hole made by the lathe (every highflow is different) in the front housing, and then tapering it out like a Garrett, a nice smooth funnel into the turbo. At the speed of sound, the airflow needs every little bit of help it can.
That said, how many of you are looking for every KW available? I should have done the same thing myself and compromised the lower intake for the benefit of lower cost, easy fitment and jigging, but as you would all know by now, I try and design my products for the best flow possible.
Hopefully Andrew does well with these, they haven't been a big seller for me over the years. Jump on the group buy guys.