[parkersextonn]

I am looking to purchase 1 7/8” long tubes. I wanted to get some opinions from anyone who is running Kooks with high-flows & anyone who is running catless. Pros & cons of each. Which one requires more work when installing.

Thanks in advance.

[Boost Creep]

Install the same.
Cats cost more and will smell of sulfur dioxide at times, and muffle some sound.
Catless is cheapest and will smell of fuel at times, and sound better.

If emissions are of no concern, I would go catless.
If emissions are a concern, cats don't really kill much power anymore, so only leaving a hand full of horses on the table.


I liked the catless sound better on my C6 than the catted '06 GTO I had, two different cars, but I still likes the catless better.

[Apex_Missing_Ape]

I've got catless 1 7/8 headers on a car with an LS3. I'm tired of the gas fumes after 6 years of living with it. I can't have the windows down at any point below about 20 MPH without making my clothes smell like gas (car also has a wicked cam). I'm swapping headers eventually.

If I swap the headers on my Camaro they will be catted.

[Rlhay2]

I've never had a set of cats last longer than a year on any car over 650rwhp. Maybe the product has gotten better but I still doubt they will last on car making 700+rwhp.


And other than the cold starts (fuel enrichment) hardly ever smelled gas fumes once the engine was up to temp.



I can easily see how catless on the OEM tune would be problematically aromatic! But a properly tuned car, you should hardly be able to tell.

[D3adpool]

Originally Posted by parkersextonn

I am looking to purchase 1 7/8” long tubes. I wanted to get some opinions from anyone who is running Kooks with high-flows & anyone who is running catless. Pros & cons of each. Which one requires more work when installing.

Thanks in advance.

Check my post if you want some idea of the gains, sound, etc.

https://www.camaro6.com/forums/showthread.php?t=535180

Hope it helps!

[Boost Creep]

Originally Posted by Apex_Missing_Ape

I've got catless 1 7/8 headers on a car with an LS3. I'm tired of the gas fumes after 6 years of living with it. I can't have the windows down at any point below about 20 MPH without making my clothes smell like gas (car also has a wicked cam). I'm swapping headers eventually.

If I swap the headers on my Camaro they will be catted.

Four years and 65,000 miles catless with almost no fumes, but I was stock LS3 camshaft.
I've heard with a decent cam, catless is very smelly.

[DFW1LE]

I have green cats on mine, no issues and no smell.