biggest bang for buck

[yellowGTS]

I am looking to add some aftermarket to my GTS but am wanting the biggest bang for my dollar. What is the best way to go? How much does it cost and what is the Horsepower gain?
Any Dyno's to prove that these gains are what they claim them to be?

Thanks for the help

[XYRCNCP]

I would have to say a CAI.

[erok]

I agree.

[IGotRice]

u can also go with nos....

[TaeMachine]

yup. nitrous.