Intake and exhaust are the basic starting points. The easier and more an engine can breath the better it will perform.

Personally, I have the Volant intake and Gibson exhaust. The Volnt is a sealed box system with a K&N cone filter inside the box. Looks great and more stock then a pipe and exposed filter.

I chose the Gibson becasue I didn't want a lot of cabin resonance. It's only a little louder then stock at idle but comes o life when you step on it.

Hope this helps

Pacifica-X