Welcome! Besides a cold air intake, Research your exhaust options carefully and make it a one time upgrade so it is relevant even if you do more major mods like heads and cam later: do you want X pipe, Y pipe, or True duals. Talk to a shop or two and check pricing and their capabilities. Investigate the tone you want your exhaust to be, lots of options. Here is what I have: Pacesetter Headers, 3" pipe throughout, QTP electric cutouts, Y pipe, high flow cat, Magnaflow catback. yes it is loud, some people don't want loud they prefer that low tone like a borla, or classic sound of the flowmaster, etc. Eliminating the rear O2's will require a pro tune, so before you pay for a tune - is also a good time to pack some more mods as mentioned in other posts so tuner can work with them all. Do all the free mods you can, ported TB's are cheap on Ebay, SLP makes a bigger MAF.
NOTE: if I were to do my exhaust all over again, I would go with painted or stainless headers, 2.5" pipe throughout, no cutouts, true duals, 2 fake cats, 2 small can mufflers out back. (see what I mean about really researching the exhaust project) Good luck with your ride!!!