Ariens 20001169 Gravely Muffler AssemblyAriens 20001169 – Replacement MPN: 20001169 MUFFLER ASSEMBLY Genuine Ariens Part # 20001169. Ariens 20001169 Gravely Muffler Assembly. Ariens Part Number: 20001169 Compatible with the following Models: Ariens Deluxe 28 Track Ariens Deluxe 28 Ariens Deluxe 24 Track Ariens Deluxe 24. We are proud to be a factory authorized retailer..