I was thinking of building a stock looking air box using two filters( possiblyone on the top and one on the side of the box) the main problem being with the stock filters is one of cross sectional area, hence the concertina folding of most filters. But a problem also lies in the intake ramp size of the box it self. I dont think it has the cross sectional area to suport high flow applications. The only ways I can see this being done is to increase its size or try and force more air into the apiture. And that looks as if you have to vent the air box funnel through the bonnet at the front of the vent and place a small intake scoop on top. As air pass over the front edge of the bonnet it is under pressure and should help the problem. Sounds good on the bench, might have a serious look at the box it self in the next couple of weeks