I think two small impellers are more likely to get moving more quickly than a single big lazy one. It's been awhile since I even looked at turbos used in competition,...so I'm far from an authority on what makes more sense when end result power is the goal,..... But..... While it is more work, and more spensive than a single,...nothing says "Whoa" quite like looking down at two of those dudes hogging up it's own header collector. But again....... You do have that "wrong engine in the wrong body" thing detracting from the "whoa appeal" bringing your open hood reaction factor down to a "Ohh,..........that's nice. In hindsight,....Maybe you should stick w/ a single then. And why didn't you buy the MS II that I just sold?