I just got a 2004 S4 with XM radio installed. XM sucks so I want to convert it to Sirius. Does anyone know an easy way to install a Sirius tuner in my car? I bought the Kenwood tuner but the hook-up is not the same and was starting to wonder if there was a converter for the unit...

Have you talked to the dealer about swapping one out?

Sirius tuner is part number 8E0 057 593

MSRP: $400

I bought the Sirius module and swapped it myself. It is pretty easy to do. I kept the XM in case I want to switch or next owner wants it.