View Poll Results: Keep or lose?
Keep the Cat
10
28.57%
Lose the Cat
25
71.43%
Voters: 35. You may not vote on this poll
STS with CATS
Thread Starter
On The Tree
Joined: Jun 2005
Posts: 119
Likes: 0
STS with CATS What you guys running with the STS kits? Are you guys running cats or get rid of them all together? I am currently have a really high flow cat but I know it retains alot of heat which case could it restrict more heat going to the turbo?....
The only downside to removing cats is emissions/inspection legality. If you're not worried about that, then get rid of them. Heat is what your turbo works on, and the less heat you can lose in a system, the better the turbo will perform
i ran cats for about 3 weeks with my sts. then i got really afraid that if the cats came apart then there went my turbo. although i dont think cats blow out that easily, just something to think about.
I had already removed my cats when I put LT's and ORY on my car when it was NA. I just put a race bullet inline right before the turbo. I didn't want to have issues with the cats due to the car being rich as hell, IE. Plugging it up, etc. Legality issues though, not sure how your smog laws are, but I know ours are strict as hell here in CA.
I would imagine it's the size of the tubing. I was originally going to reduce the size of mine from 3", but realized the turbine side IS 3" inlet. Trying every little thing to get the *** mount to run better for the new motor.
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Are you gonna race it? Are you going to use a 2-step? If so... loose the cats.
If you want to keep a monster sstreet car sleeper.... keep em. I miss how quiet my car was with cats... but had to remove them to install the 2-step.
If you want to keep a monster sstreet car sleeper.... keep em. I miss how quiet my car was with cats... but had to remove them to install the 2-step.
Originally Posted by longrange4u
Are you gonna race it? Are you going to use a 2-step? If so... loose the cats.
If you want to keep a monster sstreet car sleeper.... keep em. I miss how quiet my car was with cats... but had to remove them to install the 2-step.
If you want to keep a monster sstreet car sleeper.... keep em. I miss how quiet my car was with cats... but had to remove them to install the 2-step.
aaaahhhh the peaceful nice a quiet stock ls1....
then all hell broke loose right?! louder faster even more louder...
Teching In
Joined: Dec 2004
Posts: 27
Likes: 0
From: New Haven, CT.
Keep the cat. No mufflers and no cats = ridiculously loud exhaust without much gain at all.
Your cat doesn't retain heat, it creates the heat. Heat will help your spool time but remember it's not heat that spins a turbo it's flow. Heat expands the air which in turn will increase the flow. Reduceing your exhaust pipe size will reduce the flow to the turbo, hurting performance, not helping performance.
Your cat doesn't retain heat, it creates the heat. Heat will help your spool time but remember it's not heat that spins a turbo it's flow. Heat expands the air which in turn will increase the flow. Reduceing your exhaust pipe size will reduce the flow to the turbo, hurting performance, not helping performance.
Joined: Jun 2004
Posts: 1,501
Likes: 7
From: Ft. Irwin, California (But Virginia is home)
I've been running mine for 6 months now with cats and no issues. I'll add that I'm NOT running the stock cats, but the powerflo ones that come with the DynaTech LT header kit. The cats don't seem to impede the turbo spooling up and do keep the volume of the car to a daily driver acceptable level. It would be much louder without converters installed.
Originally Posted by 67Firebird455
I had already removed my cats when I put LT's and ORY on my car when it was NA. I just put a race bullet inline right before the turbo. I didn't want to have issues with the cats due to the car being rich as hell, IE. Plugging it up, etc. Legality issues though, not sure how your smog laws are, but I know ours are strict as hell here in CA.
What type of bullet you used and what did it do for sound
Originally Posted by OUTLAWZ RACING
What type of bullet you used and what did it do for sound
Originally Posted by 67Firebird455
Just a generic bullet at the muffler shop, anything with a straight through design to baffle it at all (try to avoid raw rasp) before hits the turbo... The car still sounded ridiculous before it came apart, wonder how it's gonna sound with stock 01 manifolds and cats on it now.
I ran 02 folds and no cats I swear it sounded like a disel. My buddy had long tubes and the full exhaust pipe and was still quiter than me. I had a 4 inch turn down 
Thanks fo the info
