The engine pipe is attached to the outlet of the exhaust manifold. It can be designed to branch in various ways. On this engine, the exhaust gas from 3 cylinders is fed into each engine pipe.
The system needs flexible mountings to allow for engine movement, and prevent noise and vibration being transmitted into the vehicle body.
On some front-wheel drive systems, the exhaust system is designed to be strong enough to form part of the engine mounting system.
Rubber mountings are popular because of rubber’s natural dampening effect.
They also allow for thermal expansion during use.