having two catalytic converters?

 

No, two individual exhaust pipes for each bank of cylinders as opposed to the single exhaust that comes stock on our cars.

 

Duh. Don't you have to have TWO catalytic converters though?

 

Duh? You should have asked more clearly.

You dont need to have any catalytic converters, but if you are attempting to pass emmisions, you will need them. 1 for each pipe, 2 total.

 

True. That's what I meant. Cars that come stock dual exhaust require two cats.

 

My car has two cats, but that doesn't mean that I have dual exhaust.

 

What's the point of having two cats then?

 

better flow and emissions

 

So, the one pipe from the two exhaust banks splits into two cats.

 

warwick you have to be more clear, or re-read what you type before you post it.....
"So, the one pipe from the two exhaust banks splits into two cats."
I'm not sure if you're thinking about what Steve said well, or if your wording was off. There are two "exhaust banks", each bank has a pipe coming from it, each pipe has a cat on it before they connect into one pipe.

 

I was talking about non-dual exhaust systems with two cats. Not the true dual exhaust.

 

There are 2 cats after the exhaust manifolds. The piping is then brought together with a y-pipe to form 1 pipe which connects to the exhaust.

Here, look at these Mac headers for a 96-97 LT1 to get an understanding of what I'm talking about.

http://www.macperformance.com/store/...Product_ID=458

 

My '96 came with 2 cats stock. I believe they started doing this in '95?

 

very end of '95, i've personally never seen a '95 with 2 cats, but i hear there are some.

I believe that in some third gens they had a y-pipe back to a collector that split into two cats, then back to a single pipe. so like both banks into one pipe, then two pipe(cats), then one pipe again. I THINK this was what they had, although I could be TOTALLY wrong The only reason I could see for this to be a good thing is because two cats flow better than one.

 

Once again - Cal 95's were made with 2 Cats. Non Cali 95's were made with single cats (ie the majority of z28's from 95)

94 and earler - 1 Cat
96 and later 2 cats