I know you all watch MTV on sunday nights and saw a UCI student getting "pimped" last night. Well The 240sx owner is active on a UCI car board and also a 240sx board and gave the low down on the process. The thread with the most information is here
It was a sham. He said his interior wasnt that bad before it went on the show, but MTV stripped it before they got to it. The student had put a bunch of money on the engine (which they threw some lights on), interior (which they stripped), and body kits, including a carbon fiber hood. The worst part; he had about 2k worth of electronics and stuff in his car that MTV took and didnt give back AND he is under contract to NOT sell his new stuff. It also took WCC about a month to do the project, and he still doesnt have his car. He said lots of the "suprise" shots were done without the car. Its all in that link above.
And if you watched the show, it was basically a plug for Need For Speed 2.