From the factory our cars are heavily restricted on airflow.
My first advice would be to check with Cobb Performance and see how you like their exhaust systems. I currently have a Cob SS3" catless catback system and love it. Its more expensive then most other exhaust out there, but the quality is definately noticable. It looks only slightly more aggressive then stock and is loud when YOU want it to be, as opposed to all the friggin time with other exhaust.
Once you open the airflow up a bit then I would suggest getting a tune. Cobb has an EM that does this admirably, called the Accesport. You would need the V2 of this little gizmo.
So...
Downpipe, Catback, Panelfilter and Engine Management and I bet you will be VERY Happy with how things feel.
Welcome btw

Have fun modding!
~E