For some time some form of 'Porter' cold air intake, a very do it yourself thing, has been popular and effective, not to mention very cheap. Basically it involves cutting the saxophone intake off and removing it, but leave some sort of lip on the air box when you do the cut. Then run an intake pipe of some sort to the inner wheel well from the air box. Personally, I just used 4 inch rubber radiator hose. That way it form fits to the cut out gap you use to the inner wheel well and has not sharp bends, like you would get if you use PVC elbows and such. Total cost a few bucks, plus your time, of course.
pax, smn