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08 STS4 V8 1SG & 04 SRX4 V8 & 01 Monte SS
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Yeah, I've actually been thinking about that...Would have to get O2 sensor delete kits too...How difficult would it be to gut these things? MN doesn't have emissions inspections so I'm good there...
I would imagine something like this:
http://www.rx8club.com/series-i-do-yourself-forum-73/diy-gutting-out-your-catalytic-converter-108878/#post1723995

Gutting your cat.
Get a foot and half to two feet long half 1/2" steel rod or something similar ( Home depot for about a buck ) and a hammer.
Flip the pipe vertically with the front (triangular flange facing up)
stick the rod inside the cat opening and using the hammer keep on whacking the internals until the rod breaks through.
The is made of 2 parts, meaning that there are actually 2 elements inside that pipe, so when you break the first one, shake the pieces out, and continue whacking on it and shaking stuff out until there is nothing left.
Use a light to see inside to make sure that it is empty. When everything is out, you'll see that the inside walls of that (now just resonator) are relatively clear and there is nothing left.

P.S
The dual structure of the cat is actually the reason the car looses power when the damn thing burns out. When the cat goes, the debris from the front part of the converter (which takes most of the abuse) completely clogs up the second portion of it, and blocks that exhaust flow.
Your engine simply can't breathe and so it starts to loose power more and more, and if you continue on pushing it, the cat will eventually clog completely, causing the engine to just shut off.
 

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2006 STS V8 1SF RWD
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6,445 Posts
Sounds like a lot of fun given that the cats are part of the exhaust manifolds...
 

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05 STS4
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4,241 Posts
curtc said:
Yeah, I've actually been thinking about that...Would have to get O2 sensor delete kits too...How difficult would it be to gut these things? MN doesn't have emissions inspections so I'm good there...
Madtuner can delete emissions codes.
 

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2006 STS
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35 Posts
So awesome being on my second set of cats. I'm done with trying to hold on to this car. Should have dumped it 4 years ago.
 

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08 STS4 V8 1SG & 04 SRX4 V8 & 01 Monte SS
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4,988 Posts
My girl has a 2004 CTs the catalyst converter just went in it. Honeycomb pieces flying out of the exhaust.
while that is an interesting / humorous failure of the cat ...
Different vehicle and this engine didn’t come in that car and therefore the warranty extension never applied.
 

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08 STS4 V8 1SG & 04 SRX4 V8 & 01 Monte SS
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4,988 Posts
I’ve just not heard of a CTS blowing cat honeycomb out the exhaust before. Usually they just get plugged up and essentially no exhaust can get through it and the engine chokes on it.
 

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Yeah I never have either. Originally thought it was the o2 sensors changed out all 4 car started up sounded great once ran for a few minutes black smoke then white honeycomb pieces shot out of the drivers side exhaust. Car has had a lot of issues.
 
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