just got my twm itb's for my gsr hatch and im thinking of the best way to set up a filter or air box for them. i know twm makes an airbox but that thing is expensive. wondering if anyone has any good ideas? so far im thinking of building a lexan box that bolts on between air horns and the itb itself, making it with 5 solid sides and a drop in powerstroke k&n filter on the sixth firewall side. just asking for ideas. thanks