I was crying watching this thinking of my own issues in Utah back in 2001-2004 on this. 96 DSM, decently modified. Back then sub 12 second cars were unicorns except on screen at the fast and furious. To help, I deleted everything in my exhaust and dumped the 02 housing to the ground, ran about 30PSI boost and C16 race fuel tuned with DSM link, still on the stock engine mind you. I was pulled for excessive exhaust. Fought it, showed the exhaust which was a 3" in dual 2.5 magnaflow universal muffler with pipes I had built, showed the tail pipe reading decrease from factory to modified (as we still had to sniff tail pipes back then). After speaking with a judge at length, he wanted to hear it since back then, fart cans on Hondas were the rage and this is what he was thinking. He followed me to the parking garage and had me get on it, even bouncing it off the rev limiter a few times. At the end, he dismissed saying he did not believe it was a 4 cylinder and that it was not loud. Bear in mind, I disabled my antilag, and still had boost set at 30PSI so the wastegate would not open, as the O2 dump sounds like a dam jet engine at power. But no matter I did sitting still it was tamed persay.
I was pulled many times over the coming years but kept my paperwork copied in the car to show cops. 99% of the time they let me go, knowing I would fight it and just waste their time. But one cop blew me away with what he seen and knew. After showing him the paperwork he walked back there, leaned down and said.... well I can see you did your research, but you need to get it to a shop, you are running WAY LEAN. Your exhaust is white. I act dumb (not hard to do just ask my girlfriend) ask to get out to see, and pretend like Im freaking out and that I will get it to the shop ASAP, and even said "smell the exhaust it smells funny" which he agreed. I drove off laughing as C16 is a 117+ octane race fuel. IE has lead, which is the white not black residue in the exhaust, and the smell. I think it smells sweet if that makes sense, race gas has a different smell when being burned. But I ran it exclusively for 4 years in the car, that the exhaust was dirty white....
Now for boostdn's issue. California. Pretty much any warning, or stupid caution you see (with the exception the famous mcdonalds hot coffee lawsuit) is caused by California, and they are so proud of it, they place their state name in it trying to shoehorn themselves into infamous state status. CARB (California Air Research Board), prop65 warning (known to the state of California) that we always see. Heck they even regulate cow farts, ban straws, and limit 2nd amendment rights. But they also try to give out so much free stuff... heck its even free to live there, look at all the people on the street! And before I catch flack, I use to be homeless as a child due to my worthless, POS mother. I pray to god to never see her again. So I have an understanding what it is like to be homeless from my 2 year adventure it in when I was 8-10.
To see this video, I can COMPLETELY see it happening. Taking stickers off wont help, modding the car REALLY wont help, raise your subs/ patreon/ ad hit up your sponsers (which FYI removing the stickers was a slap in the face to them) and just pay the fine(s), as you are going to get many. I would have fought harder on the first charge since the ticket was written, "exhaust modified to increase sound". Which it was not modified at all and you had proof, you pretty much painted a target on your back, and every cop will be looking for you as an easy payday. Whatever you do, just do NOT pay the fine in pennies. Sacramento REALLY does not like that. But great job on the thin blue line flag, that may help here or there with certain officers.
That being said, many coworkers have asked me similar questions about my N, a few of the engineers I work with have dubbed it "Veloster N.... the new VW exhaust scandal" Which depending on how you read it to it.... maybe? But I wish all my fellow California based brothers and sisters out there luck.