As the title says I have 4 XM radios and am picking up a new car with Sirius next week. I am guessing even though the two are one now I can't add the new car onto my XM for $7 can I? Does anyone know if the 6 mo. free I am getting will include the XM stuff? Also for Sirius sub's this is on a sports car that will most likely be shelved in the winter can I get 6mo. in the summer and cancel then enroll again the next summer easily or will it just be too much of a headache to save $70?