Sirius satellite keeps growing as it tries to compete with the XM satellite big boys. The 2006 BMW 3 Series and new Mercedes-Benz SLK350 will have Sirius as a factory and dealer installed options respectively. BMW's $595 option price tag includes a year of service, while Mercedes' $679 bumps up to 14-months. Will these two ever stop trying to outdo each other?
BMW & Mercedes join Sirius
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