I have a 2005 RX8 with the headunit that has the SAT button. I have seen the Sirius receiver for sale on various websites. I assume that it plugs into the 16
pin port on the back of the radio. It appears that some of the AuxIn solutions
use adapters that also plug into that same 16 pin port, as well as the upcoming
Phatbox will. So how can you use several of these devices? Do some of them
have a 'pass-thru' port on them like Pioneer does with some of their devices so
if you have several devices but only 1 port on the radio you can still use them all? It would seem strange to me that they would design the HU in a way that you had choose either SAT or some other device but could not use both.

 

Yep, you are correct, there is a special unit, and that is what I was refering to in my original post. You can see a reference to it here:

http://www.finishlineperformance.com...&preadd=action

 

They make you choose only one module for the upper and lower ports (single cd or 6 disc cd and tape deck or MD). I think it is disigned to have only one choice at a time.