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Pre FI there are 3 great things you can do in this respect.
Quality air filter: ie: k&n, trd, etc that will give a gain on stock inlet box. Second a header and tune. Research that wisely as with TC you may not even use a header, but with SC yes pick away so you'll need to firm which route you go. Tune yes that's going to go far to, again research a tuner to.
Exhaust: guys have setup either way and 2.5" is plenty for sure even up to 350HP. Over pipe, front pipe and cat backs all offer "abit" but more for sound and looks to.
Disclaimer: I'm not an expert but I am a forum whore and listen to experienced folks.
Hope that helps.
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