I've read somewhere you can sell parts before you sell the actual car, and the price of the car itself will stay the same. I've been to the shops, i've tried to sell them, but I don't know how. Can anyone help me?
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It only works on the body parts. You have to go to select the actual part (ie: spoiler) and go ALL the way to the left and select Stock. You'll have some trade-in value for your parts, putting cash in your virtual pocket.