An exhaust system on a heavy goods vehicle (HGV) serves the same purpose as it does on a passenger vehicle: to safely route and discharge the hot exhaust gases from the engine out of the vehicle. However, due to the larger size and greater power of an HGV's engine, the exhaust system is typically more complex and robust. The exhaust system on an HGV typically includes several components, such as a manifold to collect exhaust gases from the engine's cylinders, pipes to transport the gases to the rear of the vehicle, a muffler to reduce noise, and a tailpipe to release the gases to the atmosphere. Some exhaust systems may also include catalytic converters to reduce emissions, as well as sensors to monitor emissions and alert the driver or operator if there is a problem.