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I usually try and and go up in bolt size and go with a finer threaded bolt. Then make sure everything is aligned well - loosen up the muffler straps, torque the muffler/header connection - THEN firm up the muffler straps.
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Current Whip: - 2003 996 Twin Turbo - 39K miles - Lapis Blue/Grey
Past: 1974 IROC (3.6) , 1987 Cabriolet (3.4) , 1990 C2 Targa, 1989 S2
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