B1SB2294 MUFFLER/B&S #89966 & TECUOne New Aftermarket Replacement Muffler Fits Briggs & Fits Stratton and Tecumseh Small Engines This aftermarket replacement exhaust muffler fits select Fits Briggs & Fits Stratton 2 1 2 to 3 1 2 HP horizontal engines with a 1 2 inch NPT pipe connection, as well as compatible Tecumseh engines. It mounts to the exhaust port to reduce engine noise and manage exhaust gases during operation, making it a common service replacement for lawn mowers, tillers,