A couple of points.
Please take your Porsche to a dealer service bay and see what is up with the underside, it is clearly in need of some professional attention. I would do it today.
Then, if the car has been severely damaged, ask you lawyer what you might be able to sue your mechanic for. I have a feeling the repair bill on this one COULD be very high indeed.
Good luck and keep us posted.
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Rich Belloff
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