So I just got a 2011 Nissan Altima 2.5s and I want to know what kind of mods I can put on it. Being that its a 2.5 I know that there aren't many performance parts I'm going to be putting on but any small parts or suggessted appearance looks would be appreciated. Also kinda on a tight budget but anything will do, thanks.

Also thinking of putting 6000k hid low beams on and was wondering what conversion kit/brand is good/recommended.
Now im wondering about 6000k or 5000k low beams, any suggestions?