If theres a good reason for it (plastic is exspensive)
If you put it on a perfectly fine new bike
I still wouldn`t do it to a street bike, I`m not sure why anyone would want that much attention drawn to yourself, good luck fighting a ticket with "no sir, it was the other guy with the loud bike covered in cow print fur"
Look . . . the people you are after are the people you depend on. We cook your meals, we haul your trash, we connect your calls, we drive your ambulances, we guard you while you sleep. Do not fu|< with us.