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Ok, I think I get that. Now, along those same lines, can you guys tell me what the difference is between a single-plane and dual-plane intake, and what one is better for low-end than the other.



A single plane has one relatively large plenum area that feeds all the cylinders. The dual plane has two relatively small plenums each one only feed 4 cylinders. The dual plane terminology comes from the fact that one plenum floor is higher than the other so the runners can pass over and under each other. Because you have a smaller plenum the mixture flowing to the cylinders maintains a higher velocity which keeps the fuel more completley atomized and more evely distributed. This makes for better low end. On the top end the dul plane become restrictive and doesn't typically make as much power.

Dave Clement Pembroke, MA 03 PT Cruiser GT Turbo 99 Dakota SLT+ CC 4x4 68 Barracuda sport coupe http://home.comcast.net/~dgc333/