That’s exactly what is leaking. After tightening the bolts the sound was reduced but there is still a big leak. I’m going to replace the cats and install a new cat-back exhaust.Let's try again. Have you tried checking the three bolts from the exhaust manifold to the cats? The one on the inside is actually a stud that can come loose and not allow the flange to seal properly. That could explain the exhaust being so loud on that side.
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