A quick way to check for exhaust leak is to stuff a rag into the tailpipe and completely plug it up. If the car pushes your rag out or stall, you don't have a leak. If the car is running just fine, then the exhaust is leaking from somewhere.
You probably have a leaky gasket or cracked manifold. There really isn't anything you can put on. You just have to replace the faulty part.
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