Sirius and XM together possbile??

[vabeachrunner4]

Hey all, I'm considering adding a portable Pioneer Nav unit to my new '08 X5 and it is able to support XM radio as well...I already have Sirius but am a die hard XM subscriber since day 1 and want to have XM as well...Is there anyway to tie in an XM receiver to the stock system either through an open output or possibly through the AUX/REAR output??Not sure if anyone has done this or if it's possible?? I called my local dealer tech today and he still hasn't gotten back to me yet...Any ideas or thoughts would be great!!

THANKS!


PS: Also with the Sirius/XM merger coming, the packages are confusing and would actually cost more to get the channels I would want including the sports packages, ie NFL, MLB, College sports, etc. So it would be cheaper to have the full service of each.