Buying used 370z - options questions

Originally Posted by iam8up

What are the differences between 2009, 2010, 2011 and 2012? I'm not too concerned with too much performance wise, they all have the same engine and tranny (right?)

Is the factory backup camera on the 370z always in the Nav screen? Some pictures are in the rear view mirror.

I want Navigation. I'm told this requires the Sport Package (limited slip diff, fancy wheels, sport brakes). Is this true?

I would like the illuminated kick plates and splash guards, can these be added by a local dealer if I buy one that doesn't have them?

Been reading around for the last few days and I can't seem to get a good answer short of 2011 vs 2012 getting a new oil cooler. Thanks in advance!