It's the difference between DIN PS (Pferdestärke or horsepower) and imperial bhp (brake horsepower). You will find that in British roadtests and German roadtests there generally is a small discrepancy which can be attributed to this. For instance: BMW M5; 507PS and 500bhp, M3; 420PS and 414bhp. Thus 1001PS and 987bhp.
Etc, etc, etc.
What Wolfgang Schreiber said has no bearing on the matter and anyway, the Veyron IS rated at 1001PS in Continental Europe since they do not use the bhp and never have done.
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