I think your talking about a different kit than the Katana. The Katana is only sold via Sector111 as far as I know.The Katana I've seen has a larger intercooler, revised ECU program, larger injectors, and an exhaust system. The price I've seen in Germany is about 3,000 euro, if I remembero correctly. From what I read, it is about 20 HP more than Gotham.
I've seen several people make posts with one or the other. I'm just trying to figure out if the Katana is that much better.