First, let me say that I've been searching and reading posts on this topic for over dozens of hours over the last week so please do not flame me for asking something that may have been answered in the past.<p>Second, I have an 06 S60R with factory SatNav (RTI) system but no Sirius running on the HU-850.<p>I want to add an ipod and possibly add satellite radio (later) but want to control these through the existing HU. I would prefer not to have to run any cables from the front to the back of the car.<p>Based on my research it looks like the IMIV would be the easiest ipod controller to install as it will daisy chain to my RTI. I would probably just leave the ipod in the trunk and plan to hook it up via the MDC channel so I could get track title/artist info and control everything via the HU.<p>Next I did some reading on the factory Sirius module by pulling the Volvo OEM install instructions. I want to ensure that if I install the IMIV, i would still have the option to install factory Sirius later. I do not know if my car is "satellite ready" as I've read confusing thing about this--I looked in the rear compartment and do not see any extra unplugged cables or connectors save one tiny green connector with two wires (yellow and white). Based on the install instructions it looks like all I have to do is plug the Sirius into the available DIN on the back of the RTI and attach antenna and power...but the drawings are horrible and small so I'm not sure.<p>So here are my questions:<p>1) If I have factory RTI, am I automatically satellite radio prepped? It would seem crazy for Volvo to run cabling for the RTI and not for satellite.<br>2) In your opinion, is the IMIV a better/easier to install/use ipod controller than the USAspec or the OEM Volvo ipod adaptor given my set up and desired usage? <p>Thanks in advance for your help and opinions.