Audio - Thesis

[CD]

Hi!
I have a 2003 Thesis 2.0 TB.
Does anybody know if it is possible to switch from the standard audio system to the Bose system, or does this have to be ordered when new?
I have noticed that in my car there are emty speaker docks that holds speakers when you have the Bose option.

What is the difference between the two systems except for 7 more speakers and a better amplifier?

Tanks,

CD

[Zhio]

Mi thesis has fitted the Bose system, and not only speakers are different but also amplifier system. Mine has 2 amplifiers at the car boot.