The break lights are there so people know you are stopping!! You put tint on them, first it is illegal, second if someone rear ends you, they can sue you!!

There are window wind deflectors, which can keep the rain out when you crack the windows. Varoius cargo nets for the inside & rack. To go faster, there are exhausts & intakes. Reprogram your computer is you are into that. Bigger or smaller tires, lift it or slam it.. lots of options.
www.xterraparts and www.4x4parts.com are 2 good places to start looking..