There's also the Ferrari 360 Challenge Stradale that has a NA 3.6 liter V8 that produces 425bhp. Thats equivalent to just over 118bhp per liter. It's truely an amazing car.
A quote about the Challenge Stradale:
"Fine tuning is how the engineers at Ferrari extract more power from the 3.6 liter V8. More horsepower is realized through a high-compression combustion chambers, polished ports, and a larger intake tract."