Here are for example the crashtestratings of the Nissan 350Z:
2008 Nissan 350Z Crash Tests | 2008 350Z Crash Test Results & Safety Ratings at Automotive.com
The NHTSA confirmed me, that there are no US-crashtests for the Nissan 370Z... :-(
Only because of this, i must compare the safety features of the 350Z and the 370Z... This is my only chance.
Maybe i also could compare the European-370Z and the US-370Z. But Nissan USA and Nissan Europe are two different things... And now I need useful documents for this from the United States.
Thanks a lot for the first answers, people.