What makes the Diamante Alt special I wonder?

During my repeated sampling of the Advance Auto Parts rebiulds, I noticed the range of bench output currents varied drastically. I had one unit that supposedly pumped out 150A,another that barely made 100A. Didn't seem to correlate with how long they lasted though. The variability was one of the reasons I went elsewhere - figured a stock unit should be 90A and getting well above that was a recipe for trouble.

Aside from poor quality rebuilds, my only other theory is that in the 3.0 motor, the Alt (and diode pack)is quite close to the header pipes. I wondered if a generic rebuilt Mits Elec unit (they are standard on a lot of import brands)just wasn't upto running near a heat source?

Paul