I am running 2 450 foremans a 01 and a 04 ,I used 1.5 abs from the box.The triangle starts at 2" but does narrow down to 1.5 ,how do you run 2" from the air box ?and should I redo it .the foremans seem to run good but I dont want to restrict air flow?will it make a diff if I run two inch and then reduce to 1.5 going in to the air box?