After selecting the proper size exhaust pipe relative to the size of your engine (remember bigger isn't always better) it's time to choose a muffler to provide the exhaust note you like. If your ...

The spiral tubing (or pipe, if you prefer) is cut in a hand-like shape and fused together with adhesive. The knuckle joints are cut out to allow the tubing to flex at that point.

Next, the H-pipes were assembled and slid into the mufflers. The tubes were marked where they would need to be cut. A cut-off saw works great for that, but a hacksaw will work.