Mark,
Yes, thanks for responding. I returned a call to Edge a couple days ago to get clarification on stacking. I was told the issue was a topic of a meeting later that afternoon. Although Edge does not currently have dyno numbers, stacking is safe on level 1. I was asked to call back later for more info, since this is becoming a frequent querry with the recent release of the Juice/Attitude for the newer motors. I would further say that customer service at Edge has been excellent in assisting me in the application and use of their product for my specific application.
Of course, I would like to know what performance gain will result from moderate increases in rail pressure by adding the EZ, and how other functional parameters (EGT, boost, trans. slip) are affected. For my purposes, a turbo upgrade may be the next logical step.