I have been trying to find out specifically what is the difference between the Calif S/O and the 250 S/O. Powermasters told me that the; Fuel Calibration, Timing and Turbocharger where the differences. But that doesn't help me out much. Is there some place, book or dealer info where I can get the exact specs that show the difference? I thought the turbos where the same on both engines? The timing I knew about but don't have the specs. The fuel cal, well that could be anything from injectors to ECM changes. Thanks for the help guys!!!