'04 Cobra & $2500 to spend....?

I know this topic has been beaten to death, but I'm still looking for confirmation here. I've got an '04 Cobra with nothing other than a Borla Cat-back. After finally paying the car off D) I want to tweak it a bit for show & go. I've got $2500 to spend - any ideas?? (I was thinking port & polish the Eaton, JLT CAI, billetflow pulleys, and a tune. What kind of horsepower should I expect?)
Thanks Stangnet Members!!