The 2.8 liter V6 produces about 69.3 HP per liter (add 5 HP to the 2.8 and you have 71.0 HP per liter)
The C43 produces about 70.7 HP per liter.
And the I6 3.6 liter AMG motor produces a whopping 76.5 HP per liter.
Just for the record, the 2.8 and C43 motor use a compression of 10.0:1 and the C36 uses 10.5:1
Hmm, I want 10.5:1 also,.