Ya almost definitely the CSC. I did the Zspeed CSC when I upgraded my clutch. 18,000 or something miles ago, no problem.
As for the warranty... I would be very cautious before arriving at a dealership with a supercharged 370z and asking for any warranty work. I believe that you can DEFINITELY get this covered under warranty... but I would call around and test the waters anonymously and see which dealer you find appears to be the most mod friendly. Some dealers can be real jerks about modifications.
Once your car is there, they know they get the work. They get paid better to charge you versus the warranty. So I would try and make the arrangements by phone first.
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