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I got a partial answer. The last time in, the advisor told me that the last software update did something to reduce the demands on the turbos, and that there was a unnoticeable reduction in power. The idle is also somehow affected, so they raised the idle RPM setting to compensate.
My car still bogs, but hasn't stalled. I suspect the idle adjustment has sufficiently masked the idle problem. I also haven't had a good stretch of dry pavement to test the power, but I think it might be down for good. I'd love to see a dyno run to see if we have something actionable here.
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