Hello. New to this site but now have a reason to join. My new 2015 Tahoe PPV 4WD just came in last week and am waiting for equipment. I am interested if the IO3 stereo in the PPV can have SiriusXM added. I know that on the IO4 it is as simple as adding the Antenna Module that includes it but I can not find any info on the IO3 stereo. I noticed that in the owners manual it does talk about the SiriusXM operation with the base system as an option. Any help would be appreciated. Also I know I can just add a standalone SiriusXM receiver and use the AUX port but with all the other equipment we have in our rigs space is at a premium. Thanks for any help.