having a machine shop near you make them would be convienent. cant see it being that much considering its a long cylinder of steel with reverse thread and a normal threaded ends.
Well i ended up buying a pair from cfm-performance for 40$.The same company thats makes those air boxes.Only problem its going to take a while to get them.They are made of billet aluminum.I figured if i was going to buy new ones they might as well be lighter. I:I