RB or B engine? I have both manifolds for a RB 440, but I've only used the Street Dominator so far. I'm gonna try the opposite this summer, try out my Performer RPM.

In my humble opinion, the Street Dominator doesn't seem to give up too much @ the lower rpm range. But the Performer RPM is probably "better" for the street. You've got more compression, gear, and are lighter so I'd imagine you'd be missing even less than I do