Quote:
Originally posted by Great Asp
...I think the big differance is you would normally run more rev's with the single plane instead of a dual plane.
The intakes are a jump ball. There are lots of engine builders that will tell you to use a dual plane for the street. Same guys will tell you to use a vacuum secondary. I currently use a Race Demon 750 with mech secondary.
I have had both set ups on a cobra. I prefer the set up I have now. The vacuum secondaries might keep you out of trouble more than mechanical. But if you are talking about a 500+ hp motor, I would go for the single plane and mechanical secondary.
Eric 
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Also, if you ever plan on adding a supercharger and want to save a few bucks, using a single plane now will eliminate the need to swap the dual-plane out when you add the blower.
Just in case you find yourself needing a still higher power-to-weight ratio...