Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 5031 found under Muffler Exhaust Kit Hfe by Amw Cuyuna Engine Co Inc. The National Stock Number assigned to this part is 2990014988889, 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 5031.