Vin calculator thingy

V8jon said:

Just put the chassis no from my series into that calVIN thingy out of curiosity,everything is as expected apart from the last number, number 4.
It's saying: significantly modified but modifications unknown.

Does this mean it wasn't standard when it rolled off the production line or something else,it's got me wondering now
If anyone has an idea I would be gratefull

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