I watched a video in which a guy did a neat looking mod to his TBI airbox. Basically he cut the bottom of the airbox out to roughly the shape of the air filter cover and discarded what was left of the original airbox. Take a look at the video in the link (watch from 0:00 to about 1:25)
I'm considering doing this to my 94 Spirit's airbox. Should I? I know I would have to plug the vacuum hose for the heated air flap if I did it.