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@Dammit
The commercial offering isn’t (planned) to be like that - it’s a build to spec where you provide your engine on an exchange basis, and you get back either a 3.7 or a 3.9.
If you got a track special built you’d likely be ok with a total rev cut and if you slot second rather than fourth you’d expect the engine to be wrecked.
Not so much a fast road car engine- or at least that’s what we think.
The engine designer is asking us what additional margin we should add, basically.