I’m thinking about adding RNS-E to my ever-expanding mod list. I’ve spent a couple hours last night going over posts from members that have installed the Nav and I have a pretty good understanding about how to do this myself. DHall1’s write-up http://www.rs6.com/showthread.php/19837-RNS-E-updated-install-into-03-RS6?highlight=rnse+install* among a few others has helped immensely.

Here are 2 questions that I can’t find answers on:

1) The correct Nav unit for the RS6 is: 4B0-035-192-R. The A6 Nav unit is 4B0-035-192-P. What are the differences between the -R and -P? Is the -P going to work in the RS6 as well? The reason why I ask, is that I see a few -P Nav units for sale on the used market (for a cheaper price) from people that supposedly were going to install this in their RS6.

2) My Symphony II has lifetime SIRIUS satellite radio. All the write-ups reference XM radio. Is the RNS-E Nav unit compatible with SIRIUS? Are there any changes to the install because I have SIRIUS and not XM?

Anything to watch out for while looking to buy a used RNS-E Nav unit? Thanks!