Project CARS vs Real Life @ Silverstone GP / What is real?

Project CARS is gold - the beautiful next-gen racing game. Here's a clip of a BAC Mono roaring around the Silverstone GP circuit. Which one is real?

YT: There is only about a month for the final launch of Project CARS (PC, PS4, Xbox One) and here a new comparison, compared with a real onboard from a BAC Mono at the Silverstone GP circuit. The graphic realism of Project CARS makes you wonder sometimes... which of the two onboard is real?

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