Ok, I did the same fingers above the Helmet test on the passenger seat. The clearance measurement for me is the same as the drivers seat. I get 2 fingers above the crown of the helmet. Two fingers translates to 1.5" at a maximum to the headliner in my Z. You definitely sit lower in the car. It is interesting to note without the helmet, I'd say there is about 3.5" to 4" from the top of my head to the headliner. It feels very roomy for a car with racing seats and 5 point harnesses.
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Corsairprime
2014 Nismo #462, GunMetal Grey, GT-R Start Button, AAM S-Line/R-Line intake and S-Line exhaust, Berk HFCs, Osiris Tuned at JoTech
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