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That's very unfortunate...

Looks like detonation destroyed the spark plug porcelain & that did all the mechanical damage bouncing around in that hole.
However, if it was just one bank - I'm...

I've been planning to do a build thread, once it's really ready.
But the progress is super slow.

Here's one of the older pics I have on hand....

I like the new location much more.
In fact, I'm running a very similar setup in my RS6. Only a bit bigger turbo. ;)

There's plenty of room in the engine bay.
This design decision was deliberate, I think.

No easy answer.
Mild steel is significantly cheaper, easier to weld, has better resistance against "temperature-induced" cracking due to lower expansion, but can rot.
Stainless can crack very...

...restricted :hihi:

Your planned turbo is air cooled, no water.
So you'll have to delete aux pump & afterrun system.
It's sole purpose is to cool the turbos after shut-off to prevent oil coking.

Can't tell you off...

Didn't notice many questions, rather just statements of what you'll be using. :)

No experience with the clutch, so no comments there.
1000cc injectors are overkill for pump, but will work fine....

If you want the thing to be remotely reliable - do yourself a favor and pick up a set of S6/S8/A8 NA exhast manifolds and just elbow off of that. Custom made tubular stuff tends to crack really...