I had the same issue with my Rx8 a long time ago and when I called the dealership they quoted me around $250-300 dollars.. Again, this was a while back but I believe the 370z should be around this number.. Someone correct me if I am wrong.. I never ended up getting it replaced and sold that car with the crack. lol. Hope that helps some.
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2010 Nissan 370z 40th Anniversary Build #785 
Mods: F.I. CF CBE 12' | Berk HFC | Stillen Gen 3 | Z1 25 Row Oil Cooler | UpRev Tuned | CF Lip/ CF Rear Spats/ CF Diffuser/CF Side Blades
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