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I have a really bad exhaust leak on my bronco. I looked on the manifolds for cracks but I didnt see any. The sound is coming from the right side of the engine(I think its the right, whatever the passenger side is called). I know the little flexable tube that connects the EGR to the exhaust mainfold is missing. Would this cause the engine to be so loud? I replaced the crossover tube cause it was broken and replaced the little plastic valve that is connected to the thermactor system because it was missing. Only think I can think of is that little tube or a exhaust manifold gasket, whick I heard that these engines dont have one from the factory.