Runner cross section (at bell mouth) 4.185 in. Total intake volume. 671.261 ci. Before the Gen 3 Coyote existed, there was one manifold that reigned supreme over all others: the Cobra Jet.

Runner Cross-section at Bell Mouth: 2.81 sq. in. Plenum Volume: 299.258 ci. Total Intake Volume: 569.034 ci. The stock GT intake manifold is nothing to laugh at.