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I disagree.
If anything, all the "dissuading" posts should actually motivate people to post their builds once they're completed. "Prove em all wrong", you know.
Likely just most of "the builds" are...

Being aggressive towards people giving you genuine advice has no merit either.
Just something I wanted to point out.

Pardon my ignorance, but I'm yet to see <3.8 0-60 and <12 quarter from stock turbos automatic RS6 on pump gas. And I've seen many.

Realistically you're looking at low 4s and low 12s. Just barely...

All I can tell you - you're welcome to try.
You will quickly find out that it's not me "over-quoting" prices, but that your thinking is overly optimistic, unless you're okay with hacking together a...

It is possible to cut some corners, but it still won't be cheap at all.
Engine can hold 600ish for a while, provided it's adequately tuned and will not be overheated (read over-abused).

Ballpark...