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In all honesty I think the problem is more LOOKS than SOUND. I bet the tickets would be fewer and further between if you just painted the muffler black, regardless of how big of a coffee can it is.
Its kinda off topic but, I remember seeing somewhere that HKS made a nifty exhaust. It had a set of flaps in it that kinda resemble a vegetable steamer. There is a control unit that goes inside the car and you can open and close the flaps so you have a variable exhaust diameter. IDK just thought I would throw that out there.