I couldn't find any info besides top speed selling 3' extension pipes that will make "any" 370z exhaust fit a G37.
I would assume that removing 3' from the mid-pipe could make it work, but I'm not 100% that every exhaust would work.
I searched far and wide for answers and came to the conclusion that I would spend more $$$ to get the right exhaust and not deal w/ headaches.
edit: I searched google images for the same exhaust for 370z and g37 to compare. Hopefully that will help you make a decision.
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