Noob quesions
 

As a 2013 owner I am wondering if any parts would fit my car Stillen G3 intake, any exhaust. Also my old Evo the intake cause the car to run lean and could cause the motor to blow with out a tune. Would I have to tune the 370Z as soon as I put the intake on or can I run it safe for awhile.

The stillen G3's should fit fine as far as I understand. And no you definitely don't need to do a tune to just run an intake. Now if you decide to run test pipes and a bunch of other stuff along with it then yes a tune would be recommended but still not mandatory.