The car engine ventilation system is typically a pipe that carries the exhaust from the cylinders to the outside exhaust pipe unit. Exhaust smokes are dangerous in view of the fact that there are colorless, unscented poisonous substance known as carbon monoxide. A leaking exhaust unit is likely to allow carbon monoxide into the vehicle when the vents are open. Besides the fact that leaking exhaust fumes are dangerous to the human health, it also reduces the efficiency of the car. Below are some symptoms of exhaust unit leakage. continue reading..http://www.automobileglobe.com/how-to-check-exhaust-manifold-leaks/