Funny I was thinking about the stock AB the other day.
I think you need to keep in mind the flow rates are for the FILTER, not the intake. So yes, I could see how the panel filter would flow more. However when attached to the airbox it might not flow that amount, the box being the restriction not the filter element. Another post brought up a good point about the oiled filter.......if more oil on the filter could affect this.
Subscribed.......I honestly would love to dump my Typhoon and go with the OE air box with a panel filter.