hey people, i have a 98 bmw 328i. Today i got a pioneer 6 disc changer with the adapter thing so i don't need any dumb modulator shit. My question is my BMW is already "prewired" and everything and I didn't get the installation from Good Guys. If BMW says and claims its prewired, then how hard will it be to install, will i have to take the dash radio player etc out in the deck (The front?) or will i just do basic hooking up the wiring in the back. Is it worth to install it or will it be easy? thxxxxx