LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Size of stock cat? 2.5in or 3in?

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Old Oct 10, 2006 | 11:30 AM
  #1  
chesee48's Avatar
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Size of stock cat? 2.5in or 3in?

Anyone know for sure of the top of their head?

thanks!
Old Oct 10, 2006 | 11:35 AM
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Re: Size of stock cat? 2.5in or 3in?

....off a 94 lt1 that is
Old Oct 10, 2006 | 12:55 PM
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Re: Size of stock cat? 2.5in or 3in?

2 3/4in?
Old Oct 10, 2006 | 01:05 PM
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Re: Size of stock cat? 2.5in or 3in?

3 in.
Old Oct 10, 2006 | 01:24 PM
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Re: Size of stock cat? 2.5in or 3in?

The stock intermidiate pipe is 2.75", not sure if the inlet on the cat is the same.
Old Oct 10, 2006 | 06:39 PM
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Re: Size of stock cat? 2.5in or 3in?

Originally Posted by shoebox
The stock intermidiate pipe is 2.75", not sure if the inlet on the cat is the same.
Shoebox,
my HC on my emission test was 2.52 and the limit is .80....my CO numbers were fine..

my car has 112k on it...stock cat...

you think its the cat that is making me fail so badly?
Old Oct 10, 2006 | 07:21 PM
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Re: Size of stock cat? 2.5in or 3in?

I don't know jack about emissions testing, since we don't have it where I live. I'm apt to let that type of info go in one ear and out the other. Injuneer usually has some ideas about that kind of stuff.
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