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If you've got the space keep it, that way you can always revert to stock and sell the aftermarket one. The stock NPP is unfortunately not worth anything because nobody can use it (you can't upgrade from dual tip to quad tip without a new valance and the NPP function wont work). I've seen people try to sell them for $250 to someone who maybe wanted to revert to stock to trade the car in because they didn't originally have the space to keep theirs and tossed it.
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