Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 114870-13550 found under Muffler Exhaust by Mack Boring And Parts Co. The National Stock Number assigned to this part is 2990014660872, 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 114870-13550.