My understanding is that such parts are not by themselves illegal. The crime is actually using them on the road. My understanding was that they were legal for track purposes. I would never want to say that people should be able to defeat emissions, but a part of me does not like the idea that every vehicle owner is beholden to the OEM for parts in perpetuity. The "right to repair" people should be all over this fight…
The manufacturers got sued by the EPA for not actually enforcing the “for track use” only rule. A lot of the big name exhaust companies have stopped producing catless products; and others require all of your information to be on file if you’re buying a catless race downpipe. A lot of the install shops around here in Maryland that run a legit receipt paper trail of work type of business won’t even touch catless instal…
How does a manufacturer enforce the use of a device in that way?