Installing Sirius in a Factory XM ready Car

I recently bought a 2006 Cobalt with XM. Sirius wasn't an option. Is there a way I can switch to Sirius using the stock head unit (since anything aftermarket would look rediculous)? The only thing that really gets to me are the controls on the steering wheel are great! I'd hate to loose them...

u would have to use the seperate unit for the sirius. not exactly positive if it would hook up.

You could just use the FM modulator that comes with it. When you have a XM head unit that only means that you can control your satelite unit from the hu. If you don't care about that just use an FM modulator.