1. A method of designing an exhaust assembly, comprising the steps: developing an initial exhaust assembly design that comprises: an exhaust pipe having an exhaust pipe opening, the opening having an exhaust pipe height, and a bezel shield defining a shield exhaust opening aligned with the exhaust pipe opening, the shield exhaust opening having a shield exhaust height; evaluating the initial design based on a design guide; developing an interim exhaust assembly design based on the initial design and a parametric model; evaluating the interim design using a computational fluid dynamics model; and developing a final exhaust assembly design based on the parametric and the fluid dynamics models, wherein the design guide classifies a plurality of relationships between the exhaust pipe height and the shield exhaust height and requires the shield exhaust height to be greater than or equal to 1.2 times the exhaust pipe height.