One easy way to figure out if it's a body noise or a mount noise/suspension is to jack the car up and put it on 4 jack stands. Have someone listen as you would try to re-create the noise and if it is still present it would more than likely be a mount, if not then chances are you could have body noise but this would lead me to believe someone went screwy when the machines were building your car or that the car had been wrecked and had a spotty repair job.