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The M&M exhaust is probably the reason for the error code you posted in another thread. Does it have Cats at all or straight pipes. If cats, can you tell what kind or is there a service record with the car that says whether they're 100 cell or 200 cell cats?
Google the VIN, it may reference to the car being registered by the previous owner in a public record. Now you have a name and location to probe further. Not 100% by any means but I found the previous owners to both of the 997's I have owned this way. I also eliminated a car I almost bought after identifying the previous owner and learning more about him.