i want to tune my 2004 camry le v6 help?

I have a bone stock 04 camry le with the 3.0v6. Ive looked everywhere for exhaust systems and i can't find any.. just individual parts and exhaust tips. I want to put in a CAI too, ive seen a lot of different brands and i want some input, ive seen mainly K&N, Injen, and some others. Also is it possible to drop a turbo or a supercharger in the 3.0 if it has vvt-i? any help on some mods i can drop in would be a great help.