Upower Exhaust Muffler Stainless Steel 2.5 Inch Inlet - Body Length 14" Overall Length 20" Body JXS0416 Straight Through Inlet: 2.5" inner diameter - Outlet: 2.5" inner diameter - Overall Length: 20" - Body length: 14" - Body type: 4" round - Style: Directional Flow, Non-Reversible 100% welded design for long-lasting durability Stainless steel construction for lifelong protection CRF (Continuous Roving Fiberglass) technology absorbs unwanted interior resonance There is 1 year warranty for every item. Before purchasing, please make sure the Brand Logo is "Upower". Muffler inlet: 2.5&#034; inner diameter Muffler outlet: 2.5&#034; inner diameter Muffler overall Length: 20&#034; Muffler body length: 14&#034; Muffler body type: 4&#034; round Straight-through flow path Directional flow, non-reversible Superior Flow and Rich, Throaty Sound 100% welded design for long-lasting durability Stainless steel construction for lifelong protection Internal stainless steel mesh &amp; fiberglass construction Straight-through design does not restrict exhaust flow and helps cut back pressure CRF (Continuous Roving Fiberglass) technology absorbs unwanted interior resonance