On FI's website, it asks for vehicle information such as Nismo/Non-nismo, 6mt/7at, and model year. Lower on the listing, it says 2012+ may require one additional piece:
Model years 2012+ will need to purchase our coolant crossover line w/fitting & flange. This setup will replace the factory coolant line which in it's current state prevents our driver side header from properly mating to the cylinder head of the engine.
What year/type of Z was this purchased for and does it have the 2012+ crossover line?
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