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I recall years ago when I replaced my header pipe to the manifold I used a sealant in addition to the gaskets to seal up a fitful exhaust leak. I'll be replacing my cat this weekend and was wondering if I should use the same thing or just place and tighten down the new cat gasket and assume it will be leak free? Also, should I put an exhaust clamp on the end of the cat pipe where it attaches to the front of the first muffler? Thanks for your thoughts.
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'86 sedan with 411,000 miles on the original engine and automatic transmission
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