HAH, I had almost the exact experience Mike P.! Got pulled over and the cop knew they were only resonators, said as much too!
So this time I paid a premium and got a pair of "real" resonators.. no no, they are mufflers.. well kinda... Hushpower, they are nothing more than a fancy shaped glass packed resonator. But if you're looking at the outside you'd say they are a muffler.

They don't sound all that bad either! LOL .. And when the car got inspected by the "official" he didn't even mention the noise. And it is kinda loud!