350 Z few questions

Hi. I’m thinking about buying a 350Z. I actually thought about a 3.2 TT or R32. Since these super brands cost a bit more and in my opinion do not necessarily afford more I thought about an alternative. Besides, you don’t see the 350z so often on the road and that makes him something more interesting. Now I would like to know a few things: Which exhaust gas standard does the 350Z (tax costs) have? Which insurance classes does the 350z or possibly the key number have? are there known defects at the 350z which should be taken into account when buying? (if you would like to look at a used vehicle this week). What maintenance intervals does the vehicle have (costs of the respective service items “ca” Does the 350zn timing belt or chain? Thank you very much.