If you are looking for opinions, you will get plenty of those here...
Helpful facts are another thing entirely... jk lol
Like stated above, no tuners yet for the 13s. Instead you could start with a CAI (like you asked about), and combine that with a TB (both can be purchased form Moe's). These two mods together make for a nice combo that sounds good, and offers increased performance as measured by the butt dyno.
I opted for an 85mm TB, and a Volant CAI, but a lot of people here really like the Vararararararam (lol), or the S & B with, or without the scoop.