How many cats does the ss/tc have? Im getting a 3inch catless downpipe and I was wondering if theres anymore that will be holding me back after my install.

 

it has one on the uppipe, one on the intake, and 2 on the downpipe.

 

Wha???? lol

 

one on the downpipe.

I've seen people get confused because they say "three-way catalyst". That just means it removes 3 types of harmful emissions. It's one cat.

 

it has 2 cats...on the downpipe.

 

its two cats on the downpipe. I've seen them in person!

 

my vote is with him he sounds the smartest

 

But you are wrong. Two on the downpipe, saw them when I changed it for a cia catted downpipe.

 

who has pics to prove it? its been forever since i been under my car. i work 6 hours away from home so i havnt seen my car in like 3 months

 

There is 2.

 

Two cats.

A primary cat which heats up immediately to reduce emissions on cold starts. (Far left of picture in exhaust tunnel)

And a secondary cat. (just before flange, shaped like a triangle.)

 

I stand corrected. If you replace the downpipe both cats come off with it just like if it had only one.

 

dos two

 

Picture of the DP out of the car for ya'll.

 

Thx alot guys.. Alot of help!!

 

I know this is an old thread but my question is the stock down pipe 3"? Is the main difference with an aftermarket down pipe better flow with one or no cat?

 

Yup a catless will get ride of all 2 cats. Just give them to a good home and get them fixed

 

The main difference is going to be in your catalytic converter, the spun metal ones typically flow better, you also won't have the reduction in size where the 2nd o2 sensor goes. There's a nice flat spot on the stock one.

 

Where are those 2 cats that's on the up pipe and intake?? I can't find them. I will filed a complain to GM about the missing cats..

 

There is a sticky post up at the top of this forum. It will show you pictures of the OEM pipe and aftermarket alternatives if you're interested in knowing more about upgrades.

https://www.cobaltss.net/forums/2-0l...npipes-198998/