From what i have read on here in the past month about pully size is that a lightning pully will add basically 2 more pounds of boost then if you put it on a harley

IE. 6lb pully make approximatly 4 pounds on a Harley

here is my question, if this is true, does that mean if i put a 2lb Lightning pully on my Harley i will get zero boost gains out of it?
This has me stumped

Am i totally missing something here?