If my memory serves me correctly, there was a member on here years ago that flooded his 370z. I believe he was from Australia and got caught in a flash flood in a very rural area. His car was instantly totaled, but he made it out safely. His insurance replaced his car.
The design of the Z isn't partial to high water. The stock air boxes are mounted pretty low in the front. Flood the front bumper and you will successfully flood your engine. This becomes even more prevalent for those of us who have installed aftermarket air intakes, such as the Stillen Gen III or the Injen SP Series. These effectively place the conical air filter intakes lower to the ground and further forward.
Cars with raised intakes will be able to tollorate higher levels of water. A lot of off road guys mod their jeeps with snorkel type intakes. These run upwards to the roof of the vehicle. They also typically have raised suspensions that help with this along with raising the exhaust. My 2012 Civic's air box is up pretty high towards the back of the engine compartment against the firewall. Although I don't plan to test this theory, I do believe that car could handle a higher level of water then my Z. It really all boils down to the design of the car.
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~Rob 
-DD Air Guide, Stillen G3 CAIs, 63mm Throttle Bodies, Motordyne M370, Berk HFCs, FI TDX CBE (non-res, CF), Sprint booster v3, Ecutek Dyno Tuned, and the list goes on...
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