Below is a list of Exhaust Gaskets manufacturers from St. Louis, Missouri. Exhaust gaskets provide a seal on exhaust parts in vehicles to guarantee that when gases leave the engine, they stay in the exhaust system until they are expelled into the atmosphere. In the system, when gases exit the engine, they first travel into the exhaust manifold, which is attached to the side of the engine and is very hot. From there, gases travel into the exhaust pipes, through the muffler and catalytic converter and then finally through the tailpipe and out of the vehicle.