Sirius Satellite Radio [SIRI], the New York City-based satellite radio service that offers commercial-free music and sports programming to cars and homes across the country, said its hardware now is available as a factory-installed option on the 2005 Audi A8, the TT Coupe and the TT Roadster.

Sirius also will remain a dealer-installed option on these models as well as continuing as a factory- or dealer-installed option on the A4, S4 and A6 models. A Sirius retrofit kit also is available for the 2004 A8. All of these Sirius-equipped Audis will come with three free months of service and no activation fee.