I have the top speed true dual and I haven't put more than 3000 miles on it and both resonators were destroyed inside. I had my local shop replace them with a 3 inch single. Top speed is garbage their customer service is garbage and their parts are garbage. if I were you I would look into unbolting the mufflers and looking inside them and the mid resonator as well.
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2009 Nissan 370Z 6MT
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