headers, 205 shipped to your door
open cone filter, 40 bucks
PCM 50-100 depending on where you get yours, intense and 3800performance got them
plugs 104's 15 bucks
and a smaller pulley and because your car is newer the S?C is better than the 97-03 models so your pulley need to be bigger and I would get a 3.5 or 3.6 pulley
and get gauges too, like a aero force and boost gauge and oil gauge.
shift kit from intense, 50 bucks??? not to sure on that one.
all in all around 400-700 depending on what you buy and where you buy it
