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I believe the first model year 650 came with the N63 motor then they switched over to the updated N63TU. Not sure when but something you need to confirm because one is 400hp stock and the other is 445hp. The N63TU is just a "technical update" version of the N63 so they share the same basic layout and main parts.
I had a N63TU 550 and with just a mild JB stage 1 tune giving me at most 30hp and 50tq gain i was able to walk away from two different E92 M3 very easily on the highway. Walking is actually a understatement. More like running away from them. Hard to beat the twin turbo torque from that engine.
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