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These were never dynoed & never properly tuned, so can't really provide more solid info.
Passenger side WG had to be modded yes. Outlet fit "as is" if I recall correctly, maybe with a bit of...

No! That's exactly the problem with RS6 hybrids! They don't allow enough flow through the hotside.
Therefore, you don't need raised redline, since by the time you get there - yes, you're making...

Good for at least 1000-1100 newtons.
With big turbos and that torque carried over - should be able to see 700-800hp easily.

Guys, with all due respect. Check the picture that Gregg posted. Those babies will easily support 700hp. And it's not too much work to get them to fit. It's not a walk in the park either, but with MT...