runner 50 is made of a strong synthetic material that is highly resistant to gasoline alcohol methanol and other common engine fuels in the most preferred embodiment the tube runner 50 is made of nitrile u2122 synthetic and is provided with an internally bonded helical metal coil so that the tube runner 50 is non collapsible under normal conditions and will support the weight of the plenum 30 in the configuration of the invention shown in fig4 eight tube runners 50 are used to support the plenum 30 four on each side with two toward the front and two toward the back of the plenum 30 this is the preferred design for the plenum used on a v 8 engine for other engine types slight modifications are made to the plenum dimensions and configuration and the number of tube runners and plenum ports are increased or decreased to correspond to the number of cylinders being used for example for a v 12 engine four additional plenum ports two on each side are added to the bottom of the plenum in a v 10 engine two additional plenum ports one on each side are added to the bottom of the plenum in a v 6 engine two plenum ports one on each.