From quattro to quattro is fairly straightforward.
you'll need
- vr6 clutch housing (the gearbox housing is the same)
- ideally the vr6 bevel box
- vr6 bellhousing to block bolts
- obviously the engine (long block w/all coolant lines inc. from heater core, all vacuum system lines, intake etc.)
- the engine brackets (gearbox brackets are the same)
- vr6 engine wiring loom + the bit that plugs in at the rain tray to join to the interior harness
- vr6 ecu
- vr6 accessories bracket
- vr6 exhaust
From FWD to quattro .... well have fun with that