Just to try to answer one of the main questions...........Rob at Needswings say the CAI will up the HP of a NA Crossfire by about 20 HP.

I want to put a dual on too, but I can't justify it right now given it's about $800 for the dual (I like the balanced look of the dual) ........and the fact I have one kid in college, saving for a second and I'll likely be needing another car when he takes his car to college next year. I'm keeping my XFire nice and clean in the garage over the winter and don't want to make it my daily when he takes my other car to school with him..........