What exhaust?

Go with LTs if you're going with headers. As for mid-pipe, I like the Pro-chamber, but I'm not sure on fitment with anything other than Mac headers. Cat-back is pretty much your choice.
 
If you want the best gains go with Borla, magnaflow is right behind Borla in best performance. Put it with an O/R X-pipe for the best gains from your mid-pipe and get LT headers. That combination will give you the best performance gains for your exhaust. I'm not sure how good that will sound. I love the sound of Borla's but with the X-pipe I'm not sure.