ORIGINAL: 66Cuda
I thought that if you ordered the 27J package it included the sound group I. Also if you order the MyGig don’t you have to get the electronics convince group?
According the the Challenger Buyer's Guide PDF, everything listed in SGI is indeed included in the 27J package except the "6-disc DVD." From the looks of it, if you really want that you'll have to get the SGII package with that, mores speakers and a larger amplifier. SGII is cheaper than SGI because you have to have 27J to get SGII, so you've already paid for most of SGI.
Same thing with MyGig and ECG. Both have UConnect and UCI, so MyGig has an upgrade price if you already have ECG.