I just bought a 2004 S4 last weekend. I have a sub box and an amp I pulled from my old 96 A4 I sold and wanted to hook it up. Now here is the question, If I get the NAVI Plus RNS-E unit, does it support sirius satellite radio ? or the amp ? I could get an after market head unit, but I want the steering wheel controls to work so I was avoiding going into the after market units. (I know there is the adaptor to make the controls work, but seems hard to install...)

 

I just finished hooking up an OEM Sirius unit ("E" model) and an RNS-E into my 2002 allroad. Using the docs from nsxjr, along with some desire to make connectors and find parts that are out-dated, I was able to complete the project in a couple of weekends worth of work. (You know, find something, break it and have to wait a week for the new part to come UPS!)