930 - can you "de-turbo" a turbo?

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Sorry if this is a very stupid question, but can you "de-turbo" a turbo? I'm thinking of going to see a 930 – the seller tells me he removed both turbo chargers and is running the car "stock". Is this possible, will it have damaged the engine, and can it be reinstated? He tells me he still has all the original parts.

Thanks