So you have a similar problem to what i have, however, the problem lies further upstream.
Do you have ART pipes? You need to start again aligning everything from the front of the car with the connections all loose.
If you have ART pipes you may need to loosen those to alight the mid section muffler, i just haven't gotten round to it yet, it was all ok until i swapped out my HFC mids for straights.
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'04.5 350Z - Very Motordyne.
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