IMO get the one that is cheapest... rumor is most HFCs use the same core and there is no way to guarantee against a CEL.. you will need to just try it and see. If it is thrown you will either need a bung extender or a rear o2 delete.
The good thing about the HFCs is that they seem to hold their value pretty well so if you get one and don't like it you can usually resell for a reasonable amount.
I personally like the ERZ/CNT cat that I purchased. It was really cheap (around $300 shipped) and fitment was dead on.
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