Normally rod bolts are specified to allow 3 installs. First for rod machining, second for rod assembly on the crankshaft and the third for inspection...
The new differentials came right from Dana with the fluid already in them. It would be worth checking with the dealer to see if that was the case for...
You may want to check with the local Safelite as well. When I had my Cayenne S they took care of me and the local Porsche dealer sent all their glass...
I worked with Paxton on these kits and have prepared them in many variations. You want your air fuel in the 11's with steady fuel pressure at peak.
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I would imagine should the car change hands and the previous owner forgets to tell the new owner about the issue the new owner could end up replacing...