On Google, top search result for Audi V8 Schematic is eServiceInfo.com (http://www.eserviceinfo.com/download...20Quattro.html). Although the address doesn't make it clear, the Cyrillic characters at the bottom of the page indicate that this is a Russian site.

I get mighty cautious when it comes to downloads from Russian websites. Has anybody downloaded wiring schematics from eServiceInfo.com who can comment?

Thanks!