One minor thing I must mention. They are incorrect about what the original compression ratio was, it wasn't a 9.2 to 1, it was a 9.6 to 1.

There is a concept version that might produce 675hp & ~650 ft-lbs of tq. It is interesting that they had McLaren and Ricardo do the upgrades to it. That engine was first sent off to Lamborghini when it was created. That is why Chrysler temporarily owned Lamborghini.