Danny, I just watched the video. Earlier in the thread I posted than on my car(an 05 g35), I have been through 8 exhaust configurations, and I've always had a hiss when decelerating in the lower rpms.
I see that your car exhibits the same behavior. In my case, after 3 years, the cause of the hiss is still unidentified. I hope for your sake that you are correct and the join/gasket is causing the leak/hiss. Good luck.
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