Have you considered a MANIFLOW manifold???

http://www.minispares.com/search/classi ... 5DCOE.aspx

Arguably the Best single DCOE manifold available.

146 cfm through the head alone
144 cfm (2 cfm or 1% drop) with the RE
131 cfm (15 cfm or 10% drop) with the 6" Warneford/Redline
130 cfm (16cfm or 11% drop) with the Maniflow
113 cfm (33 cfm or 23% drop) with the 5" Warneford/Redline

Not wanting to get into any war or arguments, but just adding some info and a question. I have both, and both do the job admirably, i haven't HPed them or flowed them but they both certainly provide enough air for my reasonably modded Weber 45, which again i would suppose flow more than just one off the shelf, so as lownblown says, match the parts for best impact.

Now the quality of air from the manifolds is an interesting one, with the steel maniflow one being relatively smooth inside and the cast Russell Engineering one purposefully left with cast roughness. I have heard some mini people say the mini prefers a rough atomisation... not too fine, and so I had actually thought about putting something down the steel one to give it a little contour... ( just to roughen it up).... but haven't , as i don't want to butcher a perfectly good manifold that obviously works well.

The question , i ask is as to temp change and condensation. The maniflow one can have such a cool charge that in our humid qld air, condensation forms on the outside.... i have not seen this on the cast one, but I have owned it for less time ( and my first guess is it would be less susceptible to this phenomenon). Would the cooler outside cause potential for a boundary layer inside the manifold and therefore contribute to fuel dropping out of the mixture..........

I know there are other variables, like the speed through the venturi, venturi size etc, but just trying to get a 'fluid dynamics ' type response. Cheers
Darryl