I know that there are a small few out there who wished nfsu or nfsu had the 300 and were dissapointed some. However there is a way to make a JDM looking 300 out of the 340sx in the game.
Start with the5Zigan wheels. either the first or last type will work. Then use the storm bodykit. Eyelids and crimson lights with the apex exhaust tips (I kow it's not dual exhausts) Tehn use either the very first or second spoiler when you upgrade one up from stock into the aftermarket. As far as mirrors go.. there are a few to choose from.. so it's up to you..
Yes I know it's just a gussied up S13 180sx.. but it looks kind of like the z ..