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The hinge needed more clearance to make a full swing, so Louie cut out more of the original drain cowl side wall. If your cowl is like this style, you will need to build a wall around inch tall in the section you needed to cut out to keep any water from coming into your interior. This is important if you get caught in a rainstorm or are spraying into your cowl vents during washing. On this project they do not need to add a wall because they are closing off the vents on top of the cowl given it is an A/C car and don't need outside air, thus eliminating any leaks.