That looks like the plug, but mine is just sitting under the fuel pipes doing nothing as I mentioned.
I don't have the thing with 11T353N on it in your pic, or the two metal mounting tangs to locate its rubber mount either. Bike bought Nov 2012.
Since you're in the USA (?) and I'm in the UK emissions seems a good call, but I'm surprised on a small simple bike with a cat any more control is needed? I wonder what it actually does?
Cheers for the pics