Some Rare/Special Cars:
Black Stretch:
In the Mission Ice Cold Killa, after you get outside, Jizzy will hop in a black Broadway. Get in the Black Stretch beside it and kill Jizzy. You now have a black Stretch (if you don't blow it up!)
Black Broadway:
Do the same method above, except don't blow up the Broadway.
There are more, but can't think of them right now. :(
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