Unique Exhaust Design

The Insight does not have an exhaust manifold; instead, the exhaust runners are cast directly into the cylinder head. This is a pretty unique design, and I cannot think of any other car with an integral exhaust manifold. I imagine this was done to save weight. The ignition coil packs are located above the exhaust manifold. There is one coil pack per cylinder. The Insight uses a three cylinder engine, so there are three coil packs. Special indexed spark plugs are found under the coil packs.