I was looking into doing this, and I ran across an idea....
Since the clearance is an issue for those of us with an airbox, what about putting in a whole new line down to the lower fuel rail, with the correct quick disconnect fitting for whatever filter you decide. This would allow that line to be longer, and thus move the filter to a different location. Sure, you'd have to buy more hose, and another clamp, and another fitting, but.... the benefit here is that you can put the silly filter anywhere you want!
any feedback?
PE