Recently sold my S4. I still have a Ross-Tech Vag-com USB adapter. This lets you hook up your car to a laptop for diagnostic checks and for real time engine statistics. $150 or OBO Email with any questions to audi@moody.net I prefer paypal for payment.

Originally paid $250.

http://www.ross-tech.com/vag-com/index.html

 

Bump for a great product/price !!