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Its a simplified regulated return that eliminates the dead end fuel rails but allows "unused" fuel in the filter housing to return to the tank without going through the filter. Its still in trials now but will be available shortly, look for a member named FN74.
I just finished my install yesterday, made my evaluation runs today and collected all teh sound clips and data, and am trying to compile the results as fast as possible. Might take me another couple of days to finish it up, but prelim results are... "I'm grinning!!"