Adam Christian chose round exhaust ports for the Coyote head, saying they are an especially good choice when exiting into header primaries that may curve up or down, as with the Coyote headers. Furthermore, previous oval modular exhaust ports pinch their flow into the tall axis of the port in curves, but were easier to blend into one passage near the valves. The Coyote's round ports require more design care in the blend and outlet, but outflow the Three-Valve's oval ports. The extensive surface cross-hatching facilitates metal flow during casting in the foundry. Head development was so fast and overlapped that the exhaust manifold was not finalized when Todd Brewer had to establish the exhaust port outlets. So he designed them to accept four 10mm exhaust studs at each port so opposing pairs could be chosen later depending on primary pipe layout and manufacturing concerns.