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I think they sell these on eBay, don't know if they are any good. I would get them, but I don't want to be the one that finds out the fitment sucks and they throw codes.
I had Kinetix in my g35, and I went through 2 different Superchargers with the same cat also, and even when I put my car back to stock, the Kinetix Cat still worked like a charm, even until today the new owner is enjoying it. Kinetix is bang for the bucks back then.