BPD can give you a complete list of appearance modifications
For performance you're in luck, the parts are starting to come out of the woodwork. I'm testing the first set of true turbo upgrades this week, BPD will get the 2nd set. Tuning is available via Livernois and Unleashed with others working in the background right now. Depending on whether you need to pass emissions or not there's catless downpipes which are now getting pretty cheap or if you need to pass emissions with a readiness check I suggest the PPE pipes because they will definitely pass and only cost maybe 2 or 3 HP max compared to catless but cost a bit more for true cats, not bullet cats.
I'd suggest a filter for now, my company is working on a new intake as well as hot pipes (turbo to IC and IC to TB) to supplement that new turbos (stock plastic and rubber parts don't like the extra boost).
Exhaust is up to you, cutouts are being used along with Borla, Magnaflow, etc etc etc
BTW, welcome to the board!!!