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By Published on .

CHICAGO (AdAge.com) -- In their first joint distribution agreement with an automaker, competitors Sirius Satellite Radio and XM Satellite Radio Holdings announced a satellite radio agreement with Porsche Cars North America.

Beginning in 2003, customers buying Porsche 2004 model-year cars will have the choice between the two satellite radios.

XM, which launches to consumers next week, already has an exclusive relationship with General Motors Corp., which will offer XM radios in its 2002 Cadillac DeVilles and Sevilles this fall and in more than 20 other 2003 model-year cars and trucks.

Sirius -- which said it is scheduled to launch sometime in the fourth quarter -- recently announced the addition of BMW North America to its list of automaker partners, which include Ford Motor Co. and DaimlerChrysler. Sirius does not expect radios to be widely available in cars until next year.

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