I'm with you Rumble. Every test I've ever seen says the rpm is a terrific street manifold. I just have never acquired one, whereas the single planes seem to find me (cheap!) Have used a original torker, two TM-7s (one modded for max heads, $75, ) currently a Team G ($150), also got a M1 dominator ($80). Last manifold I bought new was a super Victor dominator, and it's now $100 more than I paid.