DETROIT – Porsche’s Cayenne SUV is the latest vehicle to get the satellite-radio treatment. The 2005 models of the blazing sport-ute will come with a choice of Sirius or XM satellite radio, either factory-installed.

Starting in August, Porsche owners can specify either flavor. Currently Sirius is offering three free months of service for new sign-ups; per month it charges $12.95 while rival XM charges $9.95.

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