Sorry to jack the thread, but I thought of this when I read the title. Cant you sell your stock cats for a good deal of money? Not necessarily to other Z owners but at a scrap metal yard or something? I remember somebody saying never throw away your stock cats, not just because you may need them someday, but cuz they are actually worth quite a bit of money (the cores or something?).
If the cost of the Hi-flow cats is stopping you, maybe look into selling the stock ones to ease the hit.
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