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With increased airflow the main objective of an HCI swap, it’s important to ensure there is efficiency throughout the entire intake airstream. This comparative shot of the stock and Trick Flow Street Burner lower intake manifold (PN TFS-515L0001) clearly details the major design differences between the two. The port sizes, as well as the size and length of the Street Burner’s runners (15-inch), promote improved torque and performance to about 5,500. However, because of its 12.2-inch runners and 75mm throttle-body flange, the addition of a Trick Flow Track Heat upper manifold (PN TFS-515U0002) is the bigger contributor to the increases that come from the manifold change.