New Delco style CS-130 alternator.   Specially built with heavy duty bearings, heavy duty 
windings, ramp-style voltage regulator (doesn't 
suddenly come on full amperage and burn out your electronics), and 140 amps at full output.   It fits in the original Subaru location with a custom bracket, and fits under engine cover with no modifications.
This seemed like a necessity with all of the 
electronics that have been added to the van.   The stock Subaru alternator puts out 70 amps at full output which we didn't feel was enough.   This alternator is similar to the ones they put on Freightliner semi-trucks (only more heavy duty).