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Often times the manifold on the #4 piston is cracked. I bought my car with a buggered up weld job on the manifold that didn't hold at all. It sounded like a something humming in my ear because it was right behind my seat. After a year I got one that was welded a bit nicer. Sounded so good. The car was silent at all speeds. 3 days later it cracked. My dad took the original one off and took it to his job. He works at a steel plant and had someone weld it up really nicely. Unfortunatly, the heat on #4 warped the mounting flange and now the leak is from there. It's still much quieter than before but it could be quieter. Even with 2 gaskets (an old v8 trick) it leaks. He's going to take the other cracked on in and get that rewelded but he'll bolt it down to something so it doesnt warp. Best bet is to find one that isnt cracked. The manifold gasket is about $20 tops and there are 3 bolts and 2 nuts holding the manifold on plus the egr bung. Then take the old gasket out and put a new one in and reinstall the manifold. I found it good to heat the engine up a little bit after the new gasket and tighten the nuts and bolts a little bit more. Hope this helps.
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