Jimmie, Usually people buy Dynamats at stereo shops. You can put them inside the doors (all four). You can also put some below the carpet. They are quite expensive and heavy. Therefore, it is a trade-off how much you are willing to spend and at which area. Some gen-II owners have done that. Search "Dynamat" for such threads.
Hi 1st time poster. I think your primary targets should be the front doors, then underhood, then the rear doors, then everything else. It would be interesting to know how much sound dampening is factory installed in the 2010.