Who ever told you that????? there is only 2 sizes??Know that the v6s used a smaller CFM Qjet.
I know a guy who is running one on his L6 which came from a v6 and is less then 600-650 CFMs If?
I remember right him telling me.

Larry/Twisted6
[oooooo] smile
Adding CFM adds boost smile
shocked God doesn't like ugly.