I think 526hp would be obtainable, it is a twin turbo. He mentioned that they did do some internal engine work, which would have been necassary to keep the engine together with that much boost.
526hp might be obtainable the second before the case explodes or the crank disintegrates. That's assuming he has upgraded rods and pistons. I wish the interviewer had asked more about the engine. I'm guessing that might have cut into his selfie time though.
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