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@mmccarthy
A hell of a lot less!
These days it's relatively easy to get 300bhp out of a sub 100kg engine. If you need more than that, your car is too heavy.
(Or you're racing, where forced induction belongs)
Though it should be noted that those 1000bhp/litre qualifying engines lasted for a qualifying session (well, a hot lap). Modern engines need to last 2.5 full race weekends.