Look into the exhaust vents by Oliver Enterprises, either single, double stack or the stealth option.

I have the single - and I love it.

 

Commiefornia is getting worse by the day!
I would definitely go the electronic cut-out route, I used to have mufflers with them built in on my GS300, but they are no longer available. This is what you are looking for https://raceland.com/exhaust-systems.html
They used to be cheaper 7 years ago, but worth the price vs a $1,000 fine & a visit to the state ref
good luck fitting them, would love to see how they turn out & how they sound.