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A much larger battery with more robust delivery capabilities, and MUCH better motor / inverter technology that allows the motors to produce significantly more power at higher RPM than typical motors can.
More specifically, for the M3P and MYP, the battery itself is the limiting factor, even if the motors could theoretically put out around 30kw / 50hp more combined (about 575 to the wheels max).
I would definitely pay 70-80k for an M3Plaid capable of low-10s, or a MYPlaid capable of high-10s!