It is illegal here in Kentucky to have a muffler (stock or not) on your motorcycle that emits more sound than a factory provided option. However, about 75% of all the bikes I see around here have super loud exhausts on them...mine included.
My personal opinion is if it is legal in the state where you reside/have your vehicle registered, it is the burden of the law enforcement, to know your local laws for different states, or at least bordering states.
My reasoning is this...My vehicles are registered in KY and 90% of the mileage on them comes from driving in KY. I pay KY for my taxes, registrations, and fees. My vehicles are all (mostly) legal in the state which I do my business, Kentucky. Crossing a state line should not instantly make my vehicle illegal or not. I will not remove window tint when I cross into Indiana and I cannot magically produce a duplicate license plate for the front of my truck if I drive through New Jersey.
I'm sure most law enforcement understands the basics of what is and is not reasonable, but like you, Rich Jura, I have wondered.
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