Just to update this, the sounds are all still there just the same. I think I'll ignore the sounds and just enjoy what the turbo delivers, and let it idle for a while before turning it off, in case it helps.
But to comment on how the 3071 is on the 20v, I'm really happy with it. No worries about it being too laggy or anything. At 3k rpm it still pulls harder than NA, and by 4k rpm there's some usable grunt there. Definitely a good choice of turbo for a 20v 4age, wouldn't say it's too big at all if you want power in the mid to high revs.
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