Well I bet it started cracking because it was on the lift n it flexed the roof enough to crack it but I have actually roof on a 370 not mine but a customer n it's pretty easy I would go that route just make sure who does it guarantees there work in case it starts leaking or other problems down the road they take care of it
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 2009 370z - custom two-tone paint - 20 x 8.5, 20 x 10" Rennen wheels - FI CBE - HKS RS intake
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