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I don't think a Mustang and underbody neons would be a good match. From what I've heard/read, they're illegal if you have them on when the car is moving, so you'd probably get a ticket if a cop sees you with them on. Some cops might even give you a ticket if you have them on while parked, if they think that you might be "distracting" other drivers (if you're close to the road).