I recently acquired a C5-S6 Avant with a blown engine.

Considering what to do. The rally and overlanding movement is growing...feel like doing something different.

Easiest would be to replace the 4.2 BBD engine. The heads may be salvageable. TBD.

Considering other options than per usual RS6 conversion (not that it's ruled out):
V6 TDI (450+ TQ with good MPG)
2.7T (RS6 power shouldn't be difficult)
4.2 FSI (super charged? almost 600hp)

Want to avoid a major project in terms of fabricating mounts or choppping up the trans tunnel. Any precidence or examples to delve into?

Like to keep the wagon useful. I'm losing my mind driving a Subaru to take my dog everywhere. Takes ALL the joy out of driving. The S6 has dog hair pre-installed. It's a go.

If someone feels this is too sacriligious and has a C5 All-Road or Touareg/Cayenne to offer up - would seriously consider a trade arrangement.

The S6 is worthy. One owner car. Ready for a 2nd life.

HAVE an ENGINE or MT6 Transmission TO SELL? Open to ideas.

See how this goes!