I have one that came with my Powerpack setup. I have just as many reasons to hate Banks as anyone. All of it is now gone exept for the 4" pipes and the High ram. As far as loosing power?????? Dont know of any Bonafied tests with those results. ATS makes one that looks almost identical if you cant stand the "B" word under the hood. As for mine, I dont know how a larger air way with smoother bends can reduce power.
Worth the money? Thats always a loaded Q. Its up to you. For me I would take the money and go back to stock. But since I have it, I'll continue to use it.