changed the exhaust law this year, the decibel limit didn't change. It has been 95 decibels for years, which is very liberal (pun) IMO. Any exhaust system that was legal in 2018, is still legal in 2019.
What did change, is now law enforcement is required to write a citation for the infraction, whereas previously, loud exhaust was written as a "fix-it" ticket which, if repaired in a reasonable amount of time, could be inspected and there was no fine involved. As the law is written now, a law enforcement official can write a citation for loud exhaust without necessarily using the appropriate SAE procedure for testing the decibel output of a vehicle's exhaust system. The ticket can be written solely upon the officer's judgment.
So that basically means that if you are ticketed, and have a 93 decibel exhaust system on your car, you are presumed guilty, and will have to prove your own innocence, by taking the time to take the car to an official referee to get it certified at your own cost, and then you will have to go to court to contest the ticket.
It's really a law which gives the police another reason to pull someone over, and then, chances are, the driver will have a suspended license, a warrant, no proof of insurance, the smell of alcohol or weed coming from the car, etc, and suddenly the exhaust is forgotten about.
95 decibels is louder than the majority of us would be willing to put up with on a daily basis. I would think that having mufflers of any type, particularly with the catalytic converters in place, would quiet the exhaust down well below 95 decibels.