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Here is another example of the Box R's perfectly straight, 3-inch runner design (total runner length is 10.3 inches once the upper is attached to the lower manifold). While this setup is theoretically produced for racing (it's far from being 50-state/CARB-legal) and the higher end of an engine's rpm band, we believe reasonable driveability can be achieved in Greg's Mustang through its Anderson Ford Motorsports PMS engine-management system.