yeh i had that happen to me, but i argued my way out of it... saying its not loud and doesnt let off any emissions/smoke.... and he said yeh blah blah. you should have kept arguing, mines pretty big tho.... good luck with it, but im sure youll get away with it, i havent heard of that rule, and ive asked a few people,, plus i got done about a month ago by the RTA and they said nothing about the size of my muffler!!!