i agree with cindys_sn95. i haven't had to tightened them once since intastalling them. i drove to work and home to work and home twice, re tightened them and they have never leaked :bigthumbsup
Just check them after a few hear cycles. I installed bbk shorty headers last year. I only had to re-tighten them one after a few cycles. I checked them this spring and they were still nice and tight.
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