This is a side mount small muffler with the exhaust exiting downwards. the size is for small engines, as the strap fits around the case. The inlet has been trimmed to 1.0 x 0.2 inches, and the outlet has a diameter of 0.34 with an inside of 0,28 inches the muffler weighs just 7/8 ounce and condition is good and useable. It came with a short length of plastic hose on the exhaust outlet. I combine items to reduce the shipping costs Please ask me for an invoice if you have questions on shipping, as I ship First Class whenever possible. NOTE: FREE SHIPPING IN USA ONLY