The function of the collector of a vehicle's engine consists in collecting certain air masses of various components and compartments. There are two types of collectors: intake manifold and exhaust manifold. The intake manifold collects air masses in order to direct them into the vehicle's combustion chamber. This part is usually manufactured from very durable plastic or even light metals. The exhaust manifold relates to the exhaust system. It is located right on the top of any vehicle's engine and connects the header pipe with the internal-combustion engine.

Generally, manifolds are manufactured from high-grade cast iron, consequently it can resist to high thermal load. But namely serious loads consolidated with external factors' influence lead to manifold malfunctions. The progress of the exhaust silencer's defects always lead to malfunctions not only of the engine, but of the entire exhaust system.