Engine Sound?

[DMcV]

After adding the AEM Cold air intake I've noticed some new sounds from under the hood. Some sound OK but there is one that I'm curious about
I will try to explain.... it only happens when the engine revs change between shifts...or when I rev the engine at idle... as the engine revs decrease I hear this "Ghaaaaaaaaa" sort of sound -sorry for such a poor discription- it wasn't audible when I had the stock air filter on...so I'm guessing it has something to do with the air intake sounds.
Any guesses as what this might be ??? Any harm being done ?
Thanks for your help
Dennis

 

[Mike]

The noise you are hearing was there before but more muffled through the stock air box. What the noise is is a rapid deceleration of the compressor and on your SD it might be the waste gate opening as well. Think of your engine as a positive displacement pump, one revolution moves a given volume of air, your turbo is a centrifugal pump which moves a different volume based upon suction and discharge pressures. When the positive displacement pump slows down the centrifugal pump deadheads against it.. Ghaaaaa......

 

[JLDickmon]

I think it's the headlight lenses

seriously.. I think Mike's right

 

[Logroller]

Dont forget the muffler bearings ,, or the canooter valve ,,,, be sure to check the blinker fluid while u have the hood up

 

[OLDBULL8]

No No, it's the Hyfluson Cipiltator that is gaging, the kenuton valve could also be slow acting which will make the Hyfluson Ciplitator gage

Seriously what Mike said is what it is. Ghaaaaaaaa

 

[zpd307]

i noticed a lot more noise from the motor on my 6.0 when i took the front lid off of the air box. it was soooo annoying that i promptly put it back on as soon as i could. that is why i dont think i will do the tymar filter on the new beast. i have to do something because it still has the original death air filter box that came on the early 99s....