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I connected the hose of the shop-vac from its exhaust to the silencer outlet. I sealed it with marking tape and ran the shop-vac. Oh boy, the hissy noise was very loud in the engine compartment. I removed the heat shield from the rear manifold to inspect the flange bolts. That was a good think I saw all six (6) bolts and the flange is in good shape. The hissy noise comes from the piece of pipe that goes over the engine to connect with the front exhaust manifold piece. So, I have to get that manifold out and replace it. I could feel the air flow from the shop-vac in that piece of exhaust pipe close to the transmission fluid stick.