Power steering reservoir moved and makes for very noisy steering and splashing the fluid everywhere.
I'm happy with my 06 stock. I just spent all weekend at the track and it will consistently run 16.0s hot lapping or dipping into the 15s if you leave it time to cool off.
On a side note of some experimenting I did while at the track; the "stealth CAI" differences are also stealth. All it did was mess up my idle because of the loss of induction piping to straighten up the air before it gets metered (I guess).