On the hybrid ESC system it is built into the module itself. There would have been a rubber pipe connecting it to the original manifold.
You will need to connect this to a collector tank, with a pipe then going to each individual carb pipe. Have a look on the megajolt website, there is a diagram that explains it.
http://www.autosportlabs.net/File:Ad...le_runners.png
http://www.autosportlabs.net/File:Ad...nced_tubes.png