Help! I have a 2006 Honda Civic EX that has a factory installed "XM Radio" radio. I want to have sirrius radio not XM. If the car is prewired for XM, is there an adapter ot there to make it sirius ready? Do they call a sirrius tuner for factory installed radio ? Or do i have to completely remove the radio and install an aftermarket radio, new wiring, tuner, and antenna? I was told that I might loose the radio volume and channel volume buttoms in the steering wheel when I go aftermarket? Please let me know.

Thanks