SGI vs SGII

[CRUCAT]

i just bought a used 05 C and it has Nav and Satellite radio, so I just assumed that it had SGII (thought it had to have it w/Nav), well i don't think it does as it turns out, i have the center channel speaker spot but i don't think there is a speaker there. The unit sounds pretty good to me but i was wondering if SGII was all that much better, like i say it sound good but i am a little disappointed that it was not set up w/SGII. Who would order Nav and Sat without SGII anyway?? it only adds about $300 on top of the the Nav unit itself. How can I be sure I don't have SGII?

[MrHappy]

Peek into the rear shelf and see if you have a sub with the two rear speakers. If you do, you've probably got SGII unless someone added a sub (which I doubt in the factory spot). It's on the passenger side, fyi.