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rmay635703- length of an intake system matters little. The reason throttle body spacers can work is because it affects intake plenum volume. The spacer is behind the throttle plate. Everything before the throttle plate is not too much of a concern. As long as it is all close to the same pressure and offering as little restriction as possible to the atmospheric push.
zonker - the velocity won't help all that much on more moderate cruise speeds that see high vacuum with a very small opening in throttle position. The velocity will be killed regardless. If anything I would create a diffuser type section in front of the throttle plate to help force air past the throttle plate, thus reducing pumping losses. Of course you might have to have a Ram Air intake for that to work.
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