I did just that.....see one of my old threads. Chopped off the pipe at a 45 degree angle in the air box and the flap that goes across the intake pipe by the grille. Did not notice any diff on fuel consumption and only a slight difference in throttle responce at the lowest revs before the turbo starts boosting (CRD). Was an interesting experiment but not a lot was gained.....although it has a very slightly louder intake noise.
Before you judge a man, walk a mile in his shoes; after that, who cares?! He's a mile away and you've got his shoes!