An Svt header, 2.5" flexpiper 2.5" cat back and a cold air intake would bring you about 20-22 whp and cosy you about 8-900. Best part is, your mpg will increase so long as you don't start to have a lead foot.
With the other $1000, a tune from turbo tom will help. Actually since he does free NA updates getting a tune (399 plus I think 20$ shipping) you can buy that before your mods and he usually helps tune up the car to squeeze out some power and mpg. If you have an auto he can add some aggressive shift points which I've heard nothing but good about driveability wise.
A throttle body will also help the pedal feel responsive.
Stay away from under drive pulleys there useless.
Lastly you can always get cammed and port/polish and deck your head and do some internal work. With all that you can net around 200 HP, however would cost you about 2500 altogether which then forced induction would be best.
Sent from my SAMSUNG-SGH-I717 using FF Mobile
Give rep if youve been helped :)