I've dyno'd probably 2 dozen bone stock and mild bolt on 02-04 GT's... pretty much all of them pounded out 220-240rwhp. Get a little more aggressive with the bolt ons and you get a little more hp.
You should be able to get a tq curve like this:
http://www.squarerootofone.com/images/dyno/dyno.jpg
That's a bone stock untuned 03 4.6 2v.
Here's the baseline on my untuned 5.4 2v:
http://i56.photobucket.com/albums/g1...graph-only.jpg