I have a 2011 4/4, which has had the suspension sorted. The engine left as standard apart from a mild re-map.
To be honest it lacks torque & you have to “ring its neck” to get the power out of it. The race track shows this, in that I can easily keep up with other cars in the corners, but as soon as on the straights all the other Morgan’s easily pull past. Whilst I love the 4/4 for its agility if I was buying another I would be looking at a roadster.