I'm biaed because I have the Carbonio stage 1&2 intake and I think it's dope! Looks good, sounds good, performs good. In the grand scheme of things, an intake is an intake, but my vote is for the carbonio.
Sounds great, easy to install and nice sturdy fit. It's right inline with the incoming air.
Plus, Steve is a great guy to deal with. There is no middleman to deal with, he's the man.
I would get the injen, but am partial because that is what I have. Quality is great, and the sound is intoxicating! Plus it looks better than the carbino IMO