I used to see people smoke out taillights on Volkswagens but never on a Crossfire. Anyway I wanted to give you one recommendation.

I bought LED bulbs for my xfire and it gives it a much cleaner look when breaking or at night. The LEDs aren't as bright as regular bulbs which is cool because now each section of the tail light seems seperate. Regular bulbs are so bright the whole damn thing lights up when you brake or if you have the lights on at night. On mine its just the red 'brake' circle. At night from behind, all you see is the lit up red circle, it doesn't disperse throughout the light housing. . Even when not pressing on the brakes, the LED looks a lot cleaner and sportier. When I use turn signals, only the turn circle lights up bright yellow, again it doesn't reflect into the rest of the tail light like the stock bulbs seemed to do.

Anyway I wanted to recommend these if you want a cleaner look without taking apart your light housing and fooling around with messy sprays.. My xfire is black as well, and looks awesome at night. I have LEDs all around and HIDs up front. My girl keeps promising to take pictures with her digital camera but I'm still waiting.

Get the matrix style LED bulbs at autolumination.com. I tried a bunch and these are the best, because they project light in all directions.