I have the bongiovi accessory. To see if you have it installed take off the radio face plate trim. Then remove 4 screws to loosen the CD Deck. Directly below the radio is the Bongiovi amp. It looks like a computer hard drive and it's hard to miss in such a small space.
My Bongiovi had no sticker on the Deck so taking it apart was the next idea. If you need to find out what the unit looks like just go to
http://www.bongioviacoustics.com/index_main.php and poke around. I believe it is only a Canadian option.
The Bongiovi DPS digital amp is the full name I believe.