Brought to you by Bitter End - Old School Choppers - One-Stop Shopping for Hardcore Choppin!! Replaces OEM No: 65201-37 Chrome muffler with built in Y pipe Chrome replacement muffler straight pipe inlet inner diameter 1-5/8". Top "Y" pipe inlet inner diameter is 1-3/4". These products are intended for non-highway only. Fits: UL 1937-1940 EL 1936-1940 UOM: 1 - EA