Welcome to the forum.
I would read through the tech sections for information on all the parts you listed.
Intakes do not add much power, if any, to these cars. Additionally, Cat backs are mainly for sound. Add one if you like, but you are not going to gain as much as with a proper tune + header
For adding power to a NA car: Look into OFT (open flash tablet + header + e85 if available) Or, depending on your total goals, look into ECUTEK + your desired mods.
If you are going to go FI, plan on this from the start.
