that car is electronically computer controlled and the bunch of junk sewer pipes will not help any performance the only things that happen are you use more gas/all of the injection/trans shift points/engine rpm etc is engineered in and cant be change by that junk/no proven road tests and as a mechanic for 30 yrs i know it does nothing/they have good advertising and thats it
cai and exhaust wont much if anything to these cars...but cai/exhaust/tune and youll be pretty happy (until you want to do more lol).
get an SCT Tuner and you could get a custom tune from Trick Tuners http://www.tricktuners.com/index.htm
places such as American Muscle have free tunes, but the tunes from Trick Tuners are much better, but you have to pay more. You get what you pay for though