Welcome! the best early mods are: cat back and an accessport.(Maybe intake as well AFTER accessport). Lots of subie owners buy rally armor polyurethane mudflats as well.
My 13 has 2900 miles and I have mudflap catback ap and intake. No complaints here!
Edit: I'm guessing you have the spt exhaust? If not then LOL. If you think your exhaust looks good right now.. Well, if you look up the invidia q300 burnt tip you might pee your pants. Which brings me to my next point, get the q300. The only rumble you need!