Just wanted to clarify, though OT: There is much more to the exhaust system than just the catalytic converter, and that does not stop you from upgrading to a higher-flow cat (not to mention headers, the rest of the exhaust pipes, and muffler). The only law you could violate (with a higher-flow cat) is emission pollution, but AFAIK that's not even enforced anywhere in GA except for Atlanta, I'm not even sure they have required emission testing. LE, from my experience (at least in GA), doesn't enforce the emission pollution unless there is an associative noise pollution problem (which more people complain about than the smell of no cat).
Back on topic, you are certainly entitled to say what you like to your representative. I don't think you are going to find many people here that agree with how you worded it, however. IMO, we (firearm owners) should be pushing against any kind of more restrictions. Because, if you give them an inch here, and then an inch there, before you know it they've gone a mile and we're left with limiting capacity pistols while criminals are roaming the streets with their 33-rounders.
Like it or not, when you write and present yourself as a firearm owner, people actually associate you as a sort of representative for other firearm owners, so your opinion is weighted in that aspect. ('Well if he would be ok with a ban and he is a firearm owner, other firearm owners might not mind it either')