One advantage of the Bullitt intake is that it can be ported. Ported Bullitt intakes have shown significant gains in supercharged applications but minimal gains on mildly modified or stock engines. Shown is the lower plenum. It is fed from the rear then the air enters a lower plenum, which feeds the individual runners. These runners cross over the manifold and feed the ports on the opposite side of the engine. Runner length is about 15 inches.