PICKERINGTON, Ohio Newly crowned AMA Superbike Champion Ben Spies will be a special guest on XM Radio’s PowerShift with Joe Castello tonight at 6:45 EST. Power Shift covers the world of motor sports from IRL, NHRA, F1, ALMS, AMA, ARCA and NASCAR. Castello is known for his “No holds barred” opinions while maintaining a sense of humor about his favorite motorsports. Power Shift airs Mon- Fri, 6:00 – 7:00 PM (EST) on XM143 – XMSN (Sports).