Classic black terminal style Norton Commando. Sound is very powerful and very good constructive materials allow to obtain excellent results in caferacer transformations. In addition to the classic English motion type Triumph, Norton, BSA etc. We would recommend this discharge for use on modern japanese bikes with english setting type Kawasaki W650 - W800 etc. total length 19 1/2 " about 495 mm - internal measure attack to the manifold 44.5 mm. Is it possible to buy a part of the reducers for collectors narrower. Not Approved. Sold in a pack of n. 1 piece.