Washington-based XM Satellite Radio [Nasdaq: XMSR] has introduced a new compact tuner module for car stereos that could help to spur additional sales. The universal tuner, called XM Direct, can be connected to any satellite-radio-ready car stereo with special digital adapters. XM Direct uses an open operating system to give third parties the opportunity to develop a range of adapter cables to connect the XM Direct modules to the in-dash stereo system so drivers can tune into XM Radio using their existing stereo controls.