One morning when warming up the car I got out and noticed the exhaust was whistling, rather loudly. When the car warmed up and the rpm dropped to normal, the whistle went away, so I paid no attention to it and I haven't noticed it since. However, while driving today I noticed that with the radio off I hear a quiet whistling from the rear (windows up) if I JUST BARELY apply the throttle. I don't hear the sound when off the throttle or when I am on the throttle but the exhuast is probably too loud for me to hear it if its there.

So my question is, is this normal and if not what should I be looking for?

The car has an SLP lid and SLP Loudmouth exhaust. Other than that, the engine and drivetrain is stock.

 

F-bodies are not meant to be owned by tire kickers

 

I'm not sure what you mean by tire kickers, but I have owned this car for over a year and this is the first time it has done this. I have owned V8 GM cars since I was 15 years old. I am not some noob.

I am thinking that best case its a natural frequency of the loudmouth that I have never noticed before or it could be an exhaust leak. Then again, the two instances could be completely unrelated and it could be rearend noise or the fuel pump. I am wanting to get peoples opinoins, useful ones.

Kraest, you are the reason F-body owners get a bad rap.

 

Considering that I don't own an F-body, I don't see how that's possible

 

I realized that after I posted. Saw you are a Corvette owner, which pretty much explains everything.

 

why does every post deviate so quick ?

if you are hearing an exhaust noise from the rear take a look around all of the connections of the exhaust pipe/muffler/cat etc., and see if there is any evidence of build up… as it could just be a loose connection especially if there was recent work done to the exhaust; but hard to tell

 

my guess is you are hearing the AIR pump.. (emissions stuff)

 

Well guys I think it was just the fact that it was the first time I had gotten up early in the morning and my mind was playing tricks on me (getting ready for real life instead of college life). I am very very **** about my car so I am quick to think something isn't percfect. In reality, I think it was just road noise as I recently inflated my tires to a higher pressure than normal and my wheel/tire combo has always made some noise. With the new pressure, it just made a slightly different noise than normal.

I have got to stop being so ****. Sorry for wasting your time.