The Factory BMW CD Changer is available at Pacific BMW for $379...I purchased the same unit new from a fellow on Ebay for $365 and installed it in less than 2 hours...you'll need the CD installation brackets $115 new from BMW... I have no idea about the Auto Toys unit. The installation instructions for the factory unit are on MZ3.net...but I'd be happy to answer any questions you might have....It sounds great!!