I have no idea... just hadn't seen this version yet. There are other aftermarket manufacturers making the same thing that claim some power improvements.
I think the point of upgrading to a metal pipe is the ability to safely give it a bit more boost. I just saw this option the other day as well. I've had no issues with my aFe pipe, I'm hoping that EuroCompulsion can make good use of it when I send my ECU in for their tune.
I meant to ask, are you still juggling between these? It seems like the Mishi ones have been well vetted so far, I've seen the same results with my aFe as well. The true test will be when I finally get around to pulling the pin on a tune. I went the opposite path of most here who stuck to Mishi/GFB DV+.