Patent 7520258 was granted and assigned to Hyundai Motor Company on April, 2009 by the United States Patent and Trademark Office.
An air cleaner intake duct includes a first pipe for receiving intake air and a second pipe that encloses the first pipe. A space is defined between the first pipe and the second pipe. The duct also includes a diffuser connected to the first pipe and configured to be connected to an air cleaner.