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I would guess the Mazda's as they actually raced using the high revs. They also also claimed 700bhp at 9000 rpm.
Nissan did have a special q engine that they used in 90 this was said to have 1200 bhp in a turbo at 2 bar. This was 6 sec clear of 2nd place 962. I do not have the RPM but probably less than 10,000 as they increased turbo boost to get the power
SL
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