Can someone explain what system this is?

[Hector]

Hello I know little to nothing about cars and well my friend drives a 2003 GMC dually Sierra Duramax truck with turbo and I believe an exhaust system, and I’m in love with the sound it gives off… Like shortly after starting the truck a continuous air hiss will come out of the muffler 5 seconds after idling, and every time he pushes the accelerator a loud air spit comes out of the muffler and the continuous air hiss goes away as the truck moves (why is that?) Then once he lets off the gas and the truck goes back to idle the continous air hiss comes back. I’m curious. His truck is probably the vehicle that stands out the most in our high school parking lot lol either that or my 2003 Ford Crown Vic.

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[Matthew]

This noise could be a lot of things.
No one could tell you exactly what it is. Unless they experienced it for them self’s
It sounds like a problem that needs fixed. Check for were the noise is coming from when idling.
I would point at the turbo myself and work from there.
System’s this would be are intake and exhaust.

[Author]

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