hey Mike, ya it works fine, i've done it with my E36 and i've had no problems so far, but also i assume that my car has a better AMP, cause with me E36 320i it was a 4spkr. car, and the deck would sometimes sound shitty when it got a bit TOO hot, could be cause i had a MP3 deck, or something to do with my amp, not sure yet, but in my 325i i've had NO problems up to date!!!
PM if you got anymore questions!!!