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The 997 does offer an IMS retrofit, but I have never owned an M97 or Mezger motor, I’ve only driven them briefly. flyknitlvr has and can probably give you more info on that.
Never owned a 997.1, but I do know the IMS issue is a serious concern.
By contrast, the DFI in the 997.2 is basically bulletproof.
I wouldn't even look at .1s if I were in the market.