hey guys, i'm gonna be puttin a deposit down on a legend i'm lookin at tomorrow, it's a 94L with the Bose system, if i wanna get a CD changer in there without sacrificing sound, will i have to get an OEM changer, or is there another brand that's easier to find that i can get and still have it function through the OEM headunit? also, is the car pre-wired for a CD changer? thanks in advance 