The exhaust manifold, or exhaust header, is responsible for removing exhaust gases from the engine cylinders and directing it toward the catalytic converter. The exhaust stream is collected from each cylinder and flows into the collector, where the pipes join into one main pipe.Click to see full answer. In this manner, what are the symptoms of a bad exhaust manifold? Symptoms of a Bad or Failing Exhaust Manifold Noisy engine exhaust. One of the first symptoms of a problem with the engine exhaust manifold is an excessively loud exhaust. Decreased power, acceleration, and fuel efficiency. Engine performance issues are another symptom that can be caused by a problematic exhaust manifold. Burning smell from the engine bay. Subsequently, question is, how important is the exhaust manifold? This important component can be considered part of the “lungs” of a engine, in that it exhales the gases generated during the combustion process and sends them out through the tailpipe to make way for fresh oxygen in each cylinder. Consequently, what happens when the exhaust manifold leaks? It can also become a health hazard, as the exhaust fumes can enter the car’s cabin. If your exhaust manifold is cracked or leaking, the back pressure in the exhaust system will be incorrect, which can reduce engine power, cause sputtering and other problems. Of course, you won’t pass emissions testing, either.Is the exhaust manifold part of the engine?Exhaust Manifold. Bolted directly to the engine block, the exhaust manifold is the first section of a vehicle’s exhaust system. It funnels exhaust gases from all the cylinders and routes them to the car’s catalytic converter. V-type engines have a separate manifold for each cylinder bank.