Hi pete,
I did drive the stelvio, and the engine is nice, but when I look at the technical things, the huge intake, and other evolutions from the old 4v, there should be more to get. So, or the cams are wrong, or something else is.
I drove home my own 4v after the stelvio, and that one is much stronger. Even with standard v11 exhaustsystem.
Only thing I don't get, is why they gave it such a small bore. Or there is easy more there so they can grow to 100mm or more, to get the 1400cc engine what we sometimes read about. And 1400 @ guzzi means 1351cc. If a > 100 bore fits in then they get it.