This is a brand new muffler. The specs are as follows: B Fits Quantum engines 3.5, 4 and 5 HP engines. B Aluminized steel. B Includes mounting hardware. Length 7.75" Width 3.6" Height 2.12" Intake Port 0.9" ID Replaces part numbers: 35-027 OREGON 490547 BRIGGS & STRATTON 496106 BRIGGS & STRATTON 7867 ROTARY Thanks For Your Business!! 35-027