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An exhaust flange is a device used to attach an exhaust pipe to an exhaust manifold or another piece of exhaust pipe. Commonly designed to sandwich an exhaust gasket between the exhaust manifold and the exhaust pipe, the exhaust flange is manufactured to an exact angle to eliminate the chance of any exhaust leaks when tightened.
exhaust or intake manifolds are collections of pipes or ducts or vents the intake manifold takes in the air through one opening then splits into separate pipes that go to each cylinder the exhaust manifold takes the pipes from the exhaust from each cylinder and put them together into one pipe to the exhaust if it is an intake leak the engine will usually rev up stumble hunt at idle miss or otherwise not work so good