I just set up my Sirius in the 4runner this weekend for howard's big debut. I hadn't switched it from the Acura, and had gone almost 6 weeks without it. To be honest, I don't listen to the music on it at all, my music is in my Ipod. I listen to the talk on Sirius... especially Maxim, NFL network, and now Howard.
I also always figured the crappy quality was the FM modulator, but, I plugged the Sportster directly into the Aux output in the center console so it plays directly through the headunit... and it still sounds not so hot.
And now, when I accelerate the sirius makes a whining noise! When I left off the gas, it goes away... Gotta figure out that mess next.