It’s illegal. Period. If you want to promote loud pipes, then I suggest notifying your local politician/legislator and convince them of the wonderful perks of having a loud pipe. Me? I’d go after the inspection stations. Anyone caught with an illegal mod to their exhaust shouldn’t pass inspection. Anyone caught with an illegal mod after an inspection will be grounds for the business to get fined and/or lose their license. The driver will then be cited ONE time. Any subsequent infraction is grounds for impounding. If the car isn’t picked up after 30 days, then off to the wrecking pound it goes. You wanna race? Then race your arse down to the pound and claim your rice rocket.