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'm running catless now... and STS will be here this week. installing in august tho

 

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.

 

Im using the bassani y-pipe with out cats and my car seems to spool later than with stock cats. Maybe it the size of the piping

 

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.

 

Looka Here,
This is what my machanic did to mine, he gutted it. Passed inspection with flying colors

 

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.

 

aaaahhhh the peaceful nice a quiet stock ls1....
then all hell broke loose right?! louder faster even more louder...

 

Oh yea... having 500RWHP and cats the car sounded stock... till I put my foot in it. Then I would let you see where I put my turbo.... as I smoked ya!

 

I run cats with no problems and its not all that loud, 510rwhp on 91octane

 

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.

 

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.

 

I'm running a TSP Catted Y-pipe. No problems so far. No problem spooling. Thinking about gutting them but after reading some of these posts I think ima leave them alone.

 

What type of bullet you used and what did it do for sound

 

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.

 

Its going to be quite 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