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G20 330i and M340i do have the same compression it seems, 10.2:1 though, not 11:1.
I am still not sure how the internals match up in both the engine and transmission between the 330i and the M340i. Also, wonder much programming differences between the two for the transmission could make a difference. As an example (not saying this is true), if the internals were the same, they could program the 330i to shift quicker than the M340i because perhaps the same shift speed could cause damage / wear to the gear box at the much higher torque level on the M340i. I just made that up, but in theory, there could be margins of safety differences via software and of course there can be actual different internal components. It's fun to speculate but I would love some real answers, just not sure how you would go about getting them.
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