is there any way i can find out if my '04 C230K has a bose sound system? the bass is much better than that of my friends 01 C320 with a bose system, but i dont know if i have one. i dont have a vent adjuster in the big speaker/vent in the center of the dash, and i have a 6 CD changer. i bought the car in nov 04 from my dealer used with only 2,000 miles on it but i have never been able to find out which audio system i have. "bose" isn't on the speakers on my door, but does the 6 CD changer come with a special system or do i just have a stock?