Originally Posted by
MTS
Not sure what you mean by "spools" The tiny exhaust wheel will allow the turbo to spool up faster for sure, but at an expense of limited high-rpm boost capabilities. These turbos already die out at about 5500 motor rpm. I wouldn't push them past 17-18psi as pretty much anything higher is just an expensive hair dryer (aka inefficient).
they're dual spool to try to provide the same effect as a big turbo but with quicker spool up