Hello all, I've got a strange problem, my gf's VC commodore has a strange knocking noise coming from under the car. I've checked to see if theres any movement on the tail shaft and theres none, i've replaced all the rubber mounts for the exhaust. Yet the knocking happens only when there's more then 1 person in the car (more then the driver etc) I know the noise is coming from the tail shaft somewhere, but i can't pin point it. Any ideas? Cheers.