NA is 90-97 - easy to tell because of pop up headlights
NB is 99-05 - my favorite. They drive very well. Still have the raw driving feel of the NA but with more comfort and refinement
NC - 06-present - the look quite different, pretty easy to tell. They actually do drive quite nicely. I just can't get over the looks. I hate the hood. I have seen a few with aftermarket body parts that looked amazing but to get those parts it's thousands and thousands of dollars and shipping from Japan. Also, I love boosted cars and the options for the NC are very limited