This is the O.S. T-2060SC WN One Piece Tuned Pipe With Manifold. This is the one piece variety and requires an off-road manifold, which attaches to the tuned pipe using three small springs (not included). This pipe is designed specifically for O.S. engines such as the O.S VZ-B and XZ-B engines and will deliver excellent overall performance. This pipe also features a welded nipple so you won't have to worry about losing back pressure due to an air leak. Package includes the tuned pipe, manifold, manifold gaskets and retaining springs.