The satellite radio service reports all-time highs in subscribers, quarterly revenue (up 6%) and adjusted EBITDA (up 20%). A confident CEO Mel Karmazin is even raising his guidance on the number of subscribers. Karmazin had previously predicted yearly growth of 1.4 million subscribers and now raises that figure to 1.6 million. He also increases his guidance on cash flow, from about $350 million to nearly $400 million. The subscriber growth comes from cars – #1, growth in auto sales and #2, higher OEM (factory installed) penetration of the vehicles on the lot. One year ago, at the end of 2010's second quarter, Sirius XM subscribership stood at 19,527,488. Now it's at 21,016,175, for growth of 8%. The company reports its churn is stable at just below 2%.

On the topline, Sirius XM forecasts it will produce $3 billion in revenue this year. Read the Sirius XM second quarter results here.