We just picked up our '01 4.4 last night and want to get a CD changer in it asap. However, we dont want to pay BMW the outrageous amount for them to install the stacker. I've found several new BMW CD units for sale ($300-$350) and we're wondering if anyone has done this and can give advice. Are they as easy (plug and play) as they sound to install?? Any suggestions are appreciated! HAPPY NEW YEAR ALL!!!!