How many cats? - Pontiac GTO Forum
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post #1 of 8 (permalink) Old 07-28-2016, 06:17 PM Thread Starter
 
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How many cats?

How many cats came from the factory in a 2006? Mine came without any and I need to replace them for CA smog. I've spent an hour Googling this and can't find anything on it.

Thanks,
Jon

Last edited by Cals; 07-28-2016 at 07:07 PM.
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post #2 of 8 (permalink) Old 07-28-2016, 07:32 PM
 
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Here is a pic of an 05-06 full stock exhaust. They came with one cat off each manifold.

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2005 GTO Quick - 1984 Honda V65 Magna Quicker - 2004 Z06 Quickest
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post #3 of 8 (permalink) Old 07-29-2016, 12:47 PM Thread Starter
 
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Two sounds right. This one article has thrown me off, but it discusses the 2004..."Once underneath the GTO, we can see the stock system, which measures 2.25 inches in diameter and has a total of four catalytic converters; clearly not the optimum setup for good exhaust flow"
It's here: 2004 Pontiac GTO Header Installation - GM High-Tech Performance Magazine

Thanks,
Jon
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post #4 of 8 (permalink) Old 07-30-2016, 11:07 AM
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I've only got one cat. His name is Randy

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Goat Roper and Cals like this.

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post #5 of 8 (permalink) Old 08-01-2016, 09:58 AM
 
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2004 had different exhaust then the 05-06. The 05-06 only has 2 cats right after the exhaust manifolds (or headers) as shown by AlaGreyGoat

2006 GTO M6

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post #6 of 8 (permalink) Old 08-01-2016, 08:28 PM Thread Starter
 
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Quote:
Originally Posted by GTO44 View Post
2004 had different exhaust then the 05-06. The 05-06 only has 2 cats right after the exhaust manifolds (or headers) as shown by AlaGreyGoat
Thanks!
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post #7 of 8 (permalink) Old 08-01-2016, 09:42 PM
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They all had two cats right one after each side's manifolds. It's past that they're a little different but just is size pipe, muffler type and location.

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post #8 of 8 (permalink) Old 08-02-2016, 01:21 PM Thread Starter
 
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They all had two cats right one after each side's manifolds. It's past that they're a little different but just is size pipe, muffler type and location.
Thanks!
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  Pontiac GTO Forum > The 2004-2006 GTO > Intake and Exhaust Discussions

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