I bet the power is really, really peaky, though. Like, it might make 400hp only at 8k RPMs, but almost no power at all under 6500 RPMs. That sort of power plant works great on a race track with a transmission to match, so it can always be singing along in its very narrow powerband. This engine in particular is also part of a hybrid system, so when the fuel engine falls off the boost, the electric motors can make up for it. But it would be a terrible engine in a car. Maybe, just maybe, it could be livable with a CVT, but CVTs are awful, horrible things. Better to have a bigger displacement engine with a broader power and torque curve in an everyday road car.