Hyundai has announced that it will become the first automaker to equip all its U.S.-distributed cars with satellite radios, beginning with 2006 models. The Korean auto company will install XM-ready receivers in 500,000 cars in the first year alone, a significant potential audience for the XM folks, who currently boast 3.2 million subscribers. Hyundai owners would still be responsible for XM’s $12.95 monthly subscription fee.