along with getting that you'll want to delete your resonators which is just about the cheapest thing you can do and makes a good difference. Resonator delete + a Cat-Back system = gets you off to a good start.
Dual for me since when it comes to the cosmetic part of exhaust systems I just have to have it like that unless the vehicle looks good with a single, much like this generation:I'm not liking the Magnaflow design. I would prefer a single pipe as straight as possible down the center.