Classic Wave Lincoln limousine stretch questions

I have just been looking at a Classic Wave stretched Lincoln limousine and have noticed a couple of things that I wanted to ask someone else about:
1.The original id plate inside the drivers door jam is marked VOID and a new id plate provided by Classic Wave has been installed above it. Does anyone know if this is normal practice?
2.The same vehicle has a different exhaust arrangement to that I expected. As expected the two exhaust feeds from the engine go through separate catalytic converters and then join into ONE pipe which then run the rest of the length of the vehicle to the rear. Ones I have seen in the past join after the catalytic converters but continue as TWO pipes to the rear of the vehicle. Does anyone know if this is normal practice?
Any comments anyone has are very welcome.
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Vehicles shipped to conversion companies are issued a chassis only VIN. The completed vehicle is then issued a VIN, as constructed and a new COV is issued when the vehicle is sold to a Lincoln dealership for delivery to the eventual buyer. In the case of specialty trucks, the body builder buys a simple chassis van with no body at all, or only a firewall forward body. All cars and trucks sold in the US must be sold by a franchised dealer(s). Manufacturers and conversion companies can not sell directly to buyers. In the case of conversion vans, the VIN does not change since the vehicle is simply re-manufactured
mike

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Thanks for your help
regards Martyn

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