Hi guys.. im lookin to buy a 16v.. and found a couple in Southern Cal.. but i was wondering how i can make sure i get a US Spec car.. cuz i dont want to deal with greymarkets anymore due to my past experence with a 500SEL.. Can i tell by the VIN?

and also what should i be looking for.. is thier anything that i should check on when buying a 16v.. im not shure but i though that people need to replace the timing chain? any aid will help.. thanx