umm.. underdrive pulleys? maybe a K&N cone with some sort of adapter? first off do you have the vulcan or the duratec V6? that may help somewhat. idk maybe if you really suck up to comp cams they could custom grind you some hot cams. check out these sites...

www.shoshop.com
www.shonut.com
www.tauruscarclub.com/index.php

also run a search for SHOFfast performance their site is maniy stuff for gen 3's.

your best mod? either selling it on e-bay or getting a 3.4l V-8 SHO swap...