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I posted a message about new catalytic converters, and I got a lot of responses recommending Random Technology cats (my Z is a 1990 NA auto)...I have two questions: How do these compare to stock catalytic converters? Meaning, are they as efficient, or are they sacraficing emissions for performance. I only ask this, because I need new cats to pass Wisconsin emissions (NOx)...and I have been told by a few people that aftermarket cats are only 60% efficient as OEM. Also, because the OEM cats also come with downpipes, and Random Technologies are just the cats, do the downpipes seperate from the cats on my OEM exhaust, or is custom work necessary? I'm sorry for the length of this, but I just wanted to try to make it clear as to what I was trying to say. Thanks for any help anyone can give me, ~Mike
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