Gear sets can whine. Mercedes has a test for the gears in their manual boxes before the gears go in the box. I'm not sure what Porsche does but I never had an issue with a factory gear set. When I built close ratio boxes for my club race cars I ran into noisy gears from non OEM manufacturers. Paul Guard's gears were close to the factory as far as no noise went. There was one guy out there that sold gears which sounded like you had a dentist's drill in your head.
Bottom line if you have gear noise the gears may seat into one another if you are lucky. If not I can't imagine that Nisan won't replace the gear.
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16 Cayman GT4, Carmine Red, Buckets, PCCB etc.
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