The UK quattro Network Phil Payne's Website - Loads of useful info. here

quattroforum What it says on the tin - UK based quattro forum by the users, for the users.

Audi Fans.com - subscribe to the mail list.

AudiWorld Forums Great Audi forums - very useful.

Audi quattro parts

quattro owners clubUK Ur quattro owners club with info and forum

Online Urq parts catalogue

Martin Pajak's quattro pages Canadian enthusiast site

Kim Collins quattro sports UK based quattro specialist.

Dialynx UK based quattro specialist.

SJM Auto-Technik Good info here - especially on the injection system.