FirebaseD...I'm not sure what the laws are in your state, but here in Ohio, if you buy a car with a "salvage" title, all you have to do is keep all the receipts for all the parts that you used to fix it up and make it "road worthy" again. Then you take it to your local Highway patrol Inspection station where they climb all over it trying to find "stolen" parts that may have been used in the cars rebuild. If they are satisfied that everything was done legally, they issue you a certificate to get a new title, but it very clearly shows on the title the car was a "salvage vehicle". Certainly the cars value is highly diminished by such a document, but you can still get insurance on it.
Of course every state is different, and unfortunately there still are some states where a cars salvage title can be "washed", and it looks like a "clean" title when they are done with it. I don't know which states, since I'm not in the business of ripping people off.
My nephew had a body shop about a year ago, and repaired dozens of salvage vehicles and sold them to some very happy customers. Even though the cars had salvage titles, they still looked brand new, and the people bought them for a fraction of the cost. Naturally the factory warranty is null and void, but that doesn't matter to some people. Their neighbors thought they had a brand new car in the driveway. For example, he sold my daughters friend a Pontiac Sunfire with only a couple 1,000 miles on it, and less than a year old for $5,200. A tree fell on it. All he had to do was replace the center roof panel, windshield, and hood. After he painted it, it looked like it just came off the showroom.
That's why I think the XF on ebay could have some future, as long as water didn't get into the interior where it would probably smell like a sewer. Not to mention any electrical connections that could be ruined. As for the exhaust being crooked, could that be caused by the exhaust manifolds being separated from the heads, since they opened up the motor?