Eddlebrock has a new Gen3 intake that's supposed to be a notch better than the 6.1 intake.
From what Im gathering on that is that people are not picking up with the intake. Any serious guy probably had a ported 6.1 intake and they flow very well when ported. Next is the runner lenght and I think they are about the same so no real advantage
I just read somewhere that the design was more aimed at spinning things blowing air into the front of it, only slight like 20HP gain over a 6.1 intake in NA format. And that's probably a marketing number. I did look at it at PRI and it is a very nice piece considering what used 6.1's go for and this is a nice brand new casting.