Maybe the right tank shape would fit up there then. GPs do have some extra ductwork in the way behind the tiny grilles. If he has a CAI already, theres some room over by the tower. Surely this has come up in previous threads and been neatly solved. In the hot rod shop, you start with a sheet of aluminum and just make it to fit the available space lol. A creative person might also look to the cowl area.