Stiggles mine's also Polestar tuned. From what I've read they remapped the Haldex four wheel drive system to make it more aggressive. Mine's still juddering slightly so I'm Putting a new Haldex pump on it. My rationale is that the pump is worn-out and it's pressure is low, so it doesn't have enough pump pressure to force the Haldex clutch plates together, and in turn the clutch keeps slipping and snatching, causing the vibration/rumble
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