Noise under "hard" acceleration

[YarisTouring]

Hi,

I have a 2008 1.5L Yaris and for a month there is a new noise coming from the front of the Yaris. But when I am in Neutral and slowly rev up the RPM, the sound doesn't appear. Below are 5 links showing what the noise is under different conditions.

When I accelerate from a stop

https://soundcloud.com/jays-adventures-794877724/hard-acceleration-from-a-stop


https://soundcloud.com/jays-adventures-794877724/hard-acceleration-from-a-stop-2

When I drive at 60 mph

https://soundcloud.com/jays-adventures-794877724/steady-60-mph

Slowly revving up when in neutral.

https://soundcloud.com/jays-adventures-794877724/slow-acceleration-in-neutral



There is also another noise, that maybe is not related with the first one. When I am in Drive and at a stop, this noise start to appear, which I think it's coming from below the car. But when I put it in neutral (still at a stop), it disappears. (Maybe the heat shield?)

https://soundcloud.com/jays-adventures-794877724/in-drive-when-stopped


I can do more testing/sound recording depending on your suggestions!

If you could please guide me on what to look for, thanks in advance!

[ex-x-fire]

Sounds like the donut gasket is going bad.This is between the exhaust manifold and the front pipe. Get new spring bolts too. The gasket is at #6.

[YarisTouring]

It took some time for me to repair it but you were right, it was the donut gasket like you said!