Read more for the scoop. This is by far the closest you can possibly get to a video racing simulation at the moment. For the most part, N4 is totally customizable. Engines, tires pressures, grill tape, wedge the whole nine yards. Although this is not new from N3, in this build, there seems to be a little more customization.
Car setups are limitless.
There is so much you can do in this game, that I have not even fully explored all of the possibilities, which is a good excuse for me to play the game more. You need a quality gaming system to get the full affect that N4 has to offer. If you have the system, this game looks very nice in 32-bit color with much the detail levels on full. This configuration can really load down your system. In fact, Papyrus only recommends running 32-bit color if your system is equipped with a 64 Meg video card.