One more observation from the original picture that was posted:  The tailpipes appear to be at considerably different angles - the left pipe is very high, almost beyond horizontal, while the right pipe is angled down significantly.  While there is no rule that says they couldn't have been built that way, I would doubt that a competent builder would leave it like that.  Usually there is a ball swivel joint by the exhaust manifold and then a hangar to hold the pipe in position, so of the left side of the engine dropped, which would be the normal reaction to engine torque, the left pipe would angle up.  Is this another clue that indicates a mount failure?