Originally Posted by Ryan Wopereis
Quote
coolest feature is that you can select 91 Octane, 93 Octane, 100 Octane, Stock or Valet mode all from the Cruise Control button.


That's pretty sweet. I had no idea they did that.

ya, some pretty cool stuff they have for it

http://www.goapr.com/Audi/products/ecu_upgrade_s4.html

6-MT Stage II B5 Audi S4