Elliptical welding center/center muffler. 2.25-inch or 2.50-inch free flow straight through central muffler, wrapped in stainless steel mesh. 6-inch x8 inch x14 inch, limited lifetime warranty. The tail modification in exhaust generally includes a middle drum, a tail drum, and a tail pipe, which are part of the many improved models and usually have two important concepts: sound wave and backpressure. Everyone knows about sound waves, so what is backpressure? As the exhaust port shrinks, the exhaust gas in the front row of the exhaust port accumulates at the rear. When the exhaust port is discharged, this pressure becomes negative pressure, which "sucks out" the next row of exhaust gas. This phenomenon is called back pressure..
