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I want to put Navigation in my newly purchased 1998 540i. I've narrowed it down to the stock BMW navigation for anti-theft protection and stock look.

Question: Up to what year navigation system can I upgrade to for full functionality. I know the series ended in 2003 but could later navigation systems be used? The same question applies to Bluetooth (oem) and IPOD connectivity. Also, I noticed a system called Bortmaster on ebay. Is this system OEM or aftermarket and if it's aftermarket, has anyone used this system and had success?
 
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