The Manifold for Stihl MS311 and MS391 Chainsaws is an essential component that enhances the performance and efficiency of your chainsaw. This genuine Stihl part, with OEM No. 1140 140 2501, is made from high-quality materials, ensuring durability and reliability under heavy-duty conditions. Designed to support the engine's air intake system, the Manifold helps maintain the correct air-fuel mixture, which is crucial for efficient combustion. Upgrade your Stihl MS311 or MS391 with this vital part to ensure optimal operation and longevity.