[Johnmd]

Comparing these two engines, obviously one is 50% larger than the other, but how do the turbos stack up against each other? Specifically, I'm curious about :

* Size of the turbos
* If they pretensioned the same way in Sport+
* Power and torque curve (does the same "linear" argument after 5500 rpm apply in S63tu?).

Obviously one is newer than the other, but given the opportunity, would you have taken a S63tu in an M3 chassis?