I wonder if in those states where inspection occur that the bike (or car) is unable to have it's emissions systems altered?Jersey does so does PA NY CT and a bunch of others. I won't live in a state with restrictive vehicle or gun laws.
I forget where I read it but someone changed out their muffler and intake in their truck but kept the factory ones so they could change them out for their inspection but if they were caught on the street with the aftermarket ones on, they could be charged. Living like that would suck....
I know in one of our western provinces (Alberta) the police have DB readers and have cracked down on aftermarket exhausts....especially on HDs it seems....