The Blackwing is a vast improvement over the stock airbox, as it is an open design. But to get the most benefit, you need to be drawing outside air, IE cooler air.
That's why the Vararam, and Vortex Rammer perform so well. They draw outside air.
People will argue the points of FORCED AIR with CAI's, until they are blue in the face. My point is, it's the cooler air from outside the engine bay, and not necessarily the ram effect, where the gains are made.
My $.02.
