I personally never liked neon green too much for a car color, but it sounds like the head looks cool!! But I would like you to do what you want. If it were me, I would perhaps paint the car a contrasting color (EX: Black) to the green head, or put neon green accents on the car, like striping, flames, or even badging (Honda Symbols). Just an idea. But again, do what you want or what you have a taste for. Hope it works out well for you!!