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In a message dated 11/19/99 7:43:19 AM US Eastern Standard Time, firstname.lastname@example.org writes: << If you are using stock CV carbs, there are vent lines for the vacuum slides. It is the same concept as with the float bowls. When the throttle plates are opened, low pressure is created on top of the diaphram. High pressure air (atmospheric) via the vent lines pushes up on the diaphram thereby lifting the slides. If you don't have these pressurized I would think that under boost the slides might not be opening all the way. >> This is exactly what I am looking for.Altho I am not sure of the vent lines for the vacuum slides that you are talking about.Hopefully this weekend I will have the time to pull the gas tank off and inspect the carbs to get a better idea of what you are talking about.I also have the factory ZX9 manual and that may have some of the info in it. Now for another question how about intake plenum and attaching it to CV carbs?Should I buy a set of velocity stack and machine them in order to fit an intake plenum to the carbs that way?I have a feeling that the intake plenum I am currently using is robbing me of effieciency.