I wonder how close the Enzo would be to 'LaFerrari' (That name is just ridiculous) around Fiorano if it was wearing the same tires? I know it's a short track, but 5 seconds doesn't really seem like the improvement expected with 10 years of development, a much more effective transmission, and an additional 300bhp. I would estimate at least 3 of those seconds are down to the tires alone. The transmission is then probably worth a second of improvement. That leaves the power. 300bhp for a 1 second improvement?
I don't see the point of having more than 700hp in a road car. Honestly, having driven a few cars in the 500whp range, I don't see the point in having a road car with more than 600bhp. Maybe that's just me.
I would be more impressed if the car had exactly the same power as the Enzo and was 5 seconds faster.