I just recently ordered the Avic-Z3 which comes XM and Sirius ready. i already have a Sirius subscription and i would like to stay with Sirious instead of XM. As of now i just have the plug-n-play sirius unit in my G without the tuner, thus my reception quality is pretty poor. When installing the Z3 will i still have to get the g35 serius tuner to get the best reception quality? i know it sounds a lil confusing, any help would be great tho, thanks.