Cannot comment on kit fitment as I have yet to see one put on in person yet, but all kits come primed ready for paint so it is cost of the kit plus prep and paint. You can do whatever you want with your car paint wise, but if a stock Nissan color is something you like then make sure you get that, saves a bit of money.
More air can generate more power, but there are other things to consider when doing that. When you add more air, the engine is working harder and requires supporting mods to insure it continues to operate within normal range.
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