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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 Most of the customers that purchase the RT cats from me are out in California, where the emissions are the strictest/stingiest in the US. If these guys can pass CA emissions with flying colors, there is no reason why you would have problems if the main cats is what is causing you to fail. You are not going to sacrifice emissions for performance. Flow is better with some aftermarket cats due to the larger inlet/outlet plus the shape of the cat. You want a cat that widens at the inlet then narrows at the outlet. This allows the exhaust gas to expand and fill the chamber, keeping the exhaust gas velocity constant. You have no downpipes on your NA. You will need a shop to cut off the current cats and weld in aftermarket cats, or, having custom piping from the exhaust manifold to the cats.
Later,
Phuong
 rice is a smart man/grain. you should listen to him. - infinite loop 00:04:14 09/06/01 |
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