: My 08 N* sounds deeper than 05. WHY?

10-18-12, 12:31 PM
Since I bought my 08 1sg(pcz), ive noticed it sounds way deeper than my pervious 05 N* 1se. I looked under my car and its a stock exuast. As far as performance, the 08 is faster. Any ideas why it sounds deeper.

10-18-12, 02:23 PM
Maybe the Cats or Mufflers are made differently or by a different vendor? The performance feel might be the 6 speed transmission or gearing. Are your rear gears on the 08 the same as they were on the 05?

10-18-12, 03:06 PM
the 05 had the 5spd transmission, and the 07+ N* have 6spd and 08+ are all 6spd.

10-18-12, 05:08 PM
05 has 2:73 gears and 08 has 3:23 gears. It still doesnt explain the deeper sound from the 08 northstar. My friend also noticed the deeper sound. I actually like the 08 exaust sound ;if they were made different i sure hear it and feel it.

10-18-12, 05:30 PM
They only things I can think of are:
1. Since engine exhaust sounds change under load compared to in park/neutral the gear and tranny changing has altered the load the engine feels and thereby changing the sound.
2. The air intake box and piping is different setup / internal form changing the resonance sound. So it's not a change in exhaust that you hear but a change in the induction noise.

10-18-12, 08:44 PM
!SG's often get performance gearing and TCM programming. These cars vary between trim levels and years in a lot of different ways.

Be happy & enjoy the ride!

Charles Warren
10-19-12, 07:03 AM
i noticed when i put replaced my oem airbox with open cone it got deeper and sounded like a srt8 but changes to a more nascar sound in higher rpm. and fwd n* sound deeper ive noticed that when a gxp bonneville was idling and my 2000 dts was even deeper. But some say 6l50 trans gave more issues than 5l50s i was told that by a capital cadillac tech

10-19-12, 07:12 PM
My wife's old '98 STS sounded great WOT! :)

10-23-12, 06:58 AM
I think a lot of this is how they "tuned" the car to sound
My old 01 V8 Aurora sounded great..if you like that V8 growl
The 02 STS sounded the same...but just a little more subdued
The 05 STS is even more subdued than the other two were

Al three had the northstar...the 05 an improved one

But..I think its just the way they were tuned to sound


10-23-12, 10:30 PM
The intake has a lot to do with the sound under WOT. Our old '98 STS had a sweet roar. Our new ones are quicker and corner better.

10-24-12, 12:34 AM
I think my 05 sounds pretty good. I even had the neighbors teenage son ask me what I had in the thing, he said it sounded mean as I drove away from my house.

10-24-12, 12:40 AM
The intake has a lot to do with the sound under WOT. Our old '98 STS had a sweet roar. Our new ones are quicker and corner better.

Agreed, my 2001 really woke up under heavy acceleration, but this one is way more fun to drive!