The definition of an exhaust supply is a system of components that are used to reduce the amount of exhaust gases that are emitted from a vehicle. This system is made up of several parts, including the exhaust manifold, catalytic converter, muffler, and tailpipe. The exhaust manifold is responsible for collecting the exhaust gases from the engine and routing them to the catalytic converter. The catalytic converter is then responsible for converting the harmful gases into less harmful ones, such as carbon dioxide and water vapor. The muffler is then used to reduce the noise that is created by the exhaust gases, while the tailpipe is responsible for releasing the gases from the vehicle. All of these components work together to ensure that the exhaust gases are reduced to an acceptable level.