I live in mass and I always see neon lights being used , not so much on mustangs but I have seen them on suvs, it looks really bad . The only thing Im aware of thats a big law for cars is side exhaust. Im not sure why.

 

I meant underglow. Doh!

 

Illegal in mass while moving, okay while parked, but they need to be DOT approved. I can't think of a set that has been.

I would take the money and buy performance for the car, looks second.

 

If you are on private property that isn't yours, they are still illegal.
My friend tried this in court, he got stuffed with a $400 dollar fine. They are all out illegal to have on your car here.

 

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It's just a matter of the cop who pulls ya over and how bad of a mood he's in.

But, my point is - you can take it to court and you will lose.