Satellite ready 6 disc?

[mrmayhem]

I recently traded my 03 Avalanche for an 03 H2. Both interiors look nearly identical.. and the Stock radios (6 disc bose) are the same (at least looks). The Av had XM built in... The H2 does not from what I can tell. I switch the sources.. and it toggles from AM to FM and CD.
My question is .. can the SIR GM1 be used to add Sirius radio to the stock system? without any serious mods? And other than what I listed above.. is there any other way to tell if the stock radio is sat compatable?
I'm guessing its not.. but i can always keep my fingers crossed.