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Intake Hole Cut

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Once the stock airbox was removed, we cut a hole in the cowl using a drill with a 411/42-inch hole-saw bit. This perforation into the cowl will allow positive air pressure from the sloping windshield to dump into the Scotty Air intake plenum. This hole may seem like a drastic measure for better airflow. We surely thought so until we cut it out and realized the large cavity that existed behind was an untapped void full of pressurized cool air when the truck was moving forward.