RE: The only down side to a 08 challenger
I agree with Roswell. You can do somethings to personalize it, but I wouldn't go hog wild. Should you ever consider selling it in the future (not that I'm going to with mine), you may end up kicking yourself, because someone didn't share your vision.
If I were considering something as grandiose, I would buy a the rock bottom cheapest base, drop a crate in it, and make that sucker ROCK. Gut the interior, call Unique Whips, Chip Foose and any other mod'ers to have at it and trick that sucker out. You could probably get one of these things running pretty hot, and looking very potent w/ 20 K in it.
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~) 69.5 SuperBee