www.vwvortex.com
I know it says vw on there, but if he goes in and explores, there is a section on their message board just for Audi stuff, and a section just for A4 stuff. From there, he might be able to find more, but that one is supposedly pretty good.
A forum community dedicated to all Mitsubishi 3000GT and Dodge Stealth owners and enthusiasts. Come join the discussion about performance, modifications, VR4 turbo upgrades, troubleshooting, maintenance, and more!