as the title says, how loud is a STS setup with and without cats on a stock and modded engien??

just after ball part dB figures

thanks Chris

 

You mean how loud is the turbo whine or the car overall?

 

Hmm..db figures would be interested to get, but its really hard to say.
Under normal driving, you hear a lite turbo whine (sounds really nice) and under boost you can hear it quite well.

As for exhaust, if you have cats on the car, it really quiets down the exhaust and turbo whine and is very quiet overall.

If you are wondering whether or not it is too loud, the answer is definitely not, either way (cats or not).

We actually did a custom dual pipe setup on one of our Trans Ams that involved quite a bit of extra exhaust piping coming out of the turbo, and with that particular setup, you could barely hear the turbo whine at all. So if you want the loud turbo whine, you can go with a single short pipe. If you don't want it, you can go with something bigger. Some guys have even put bullets in the exhaust pipe, but that is not for me

 

i have an STS with headers and no cats , it was way loud. had to install a bullet muffler to take out some of the noise, not turbo whine just loud exhaust , like an NA exhaust. with a bullet muffler on tailpipe after turbo its driveable around town and has a nice low rumble, turbo spool is like an aircraft eng just a rush to hear.

 

I have STS with a customized Borla with a Dynomax bullet after that. I'm planning on adding another bullet that runs to the driver side outlet and connects the wastgate. With cats its not loud but i wouldnt run it with cats either. With my current setup its at the same sound level as the small flowmaster POS muffler my car had before. Mufflers after the turbo have a greater affect then on a NA car.

 

It's loud with no cats and no mufflers after the turbo.


I built a custom dual exit, dual muffler setup for mine and it's now as loud as your average cat back system at worst, alot quieter in alot of situations. Still plenty of turbo whistle when you get on it as well.

 

thanks guys. just wondering about using a STS on another car (with a LS enigne) here inthe UK.

for track days we ahve tight noise reg! some are as low as 100bd wich makes it hard to get alot of modded cars through!

Chris.

 

Mine is loud and proud! Whoop-Whoop! Haaaaaaaa

 

My DIY rear mount was load without the cats. You could still hear the turbo whine mixed in with the roar of the LS1. the sounds turns a lot of heads.

 

what are theos bullet mufferls you guys were talking about???

Chris.

 

Here is a quick burn http://video.ls1tech.com/video/3745ee8d-64f7-4ea1-90f3-bad9a9c2783d.htm]video[/URL] I made a while back. I still have cats but it's not that loud at all.

 

i dont see how you guys could be putting mufflers in these i LOVE the sound....all of it...there is not one point where i think "man that is annoying"

sure it louder than stock but not by much at idle......and WOT i want my car to sound loud...as long as its a good loud....and i think the jet engine sound is great

 

It's fine with me at idle and full throttle. Now highway cruising is a totally different story, to drive it any distance I had to quiet it down.

 

i guess..we all have our own thoughts....i just got back from a 850mile trip in mine...i can drown it out with the radio if i have to....i dont think its that bad at all tho

 

navymitch12 you have cats?

 

yes.......yea, that prob shuts its up a good amont.......

i will be taking them out soon tho...

 

I have long tubes with 3" piping back to the turbo with no cats and it is loud. I like the sound at idle, cruising around town and WOT, but long cruises on the highway are not really pleasurable sound-wise. It drones like crazy. Of course my 4.11s don't help that either.

I will probably be going back to stock manifolds for heat retention later. This will make it easier when I have to put the cats back on every year after next year for emissions anyway. I'll do some testing to see the power and spool time differences and post the results...

 

Without cats on my gto the highway drone can get annoying. It never really bothered me until this week when I drove it from Atlanta to Houston and back instead of my work truck.

 

Mine is way more quiet than the magnaflow cat back I had before. I liked the sound of the magnaflow better but it sounds more like stock with the turbo on now.

 

My buddy has one. He started w/o a muffler, it was somewhat raspy alomst obnoxious. We added a bullet after the turbo and it sounds tons better. Not so much exhaust rasp anymore, makes the turbo noise more noticeable. Sounds good.