Will I kill the value of my Demon

I own a true FJ6 car and there a few things to consider. Demon 340's are somewhat scarce and originality helps in value. I can tell you with the FJ6 unless you have a lot of black to break up the color it is god awful to look at, it is just way too much. F7 with white stripes would look really good IMO, and you won't see another one parked next to you which is nice. As others have said, you would need to do the engine compartment, trunk, jambs and all and is that really all worth it. At the end of the day it's your car and if you just aren't going to be happy with it because of the color you need to do what you have too.