Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number G649-4201-F148 found under Muffler Exhaust by Electric Boat Corporation. The National Stock Number assigned to this part is 2990015348692, and the Federal Supply Class is 2990 Miscellaneous Engine Accessories Nonaircraft. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like G649-4201-F148.