Noise from rear

[DWBOX2000]

Wouldn't the mechanics have a way to test that? Considering they are Porsche Indies, they should have done that. Well I would hope.

How would I check?

[78F350]

Can you have someone outside the car listen for the noise and you drive by slowly? It may help to locate the source. Maybe record a short video to put on Youtube to share so we can hear it?
The trailing arms make a rattling noise over small bumps.
A burr on the inside edge of a wheel will make a click if it hits the parking brake cable.
The metal guard for the brake rotor will make a scraping sound if it is bent and slightly rubs the rotor.
A worn out mount (engine or transmission) will make a thump with a change of torque.
Wheel bearings groan or whine.
Cats meow.
Cows go Moo.

[NewArt]

Originally Posted by 78F350

Cats meow.
Cows go Moo.

But, what does the fox say?!!:dance:

[DWBOX2000]

Noise is definitely when the car is cold. I heard when I left the house this morning and 20 minutes later, very faint if anything. Could it be the coolant tank moving a bit when cold and not when warm?