Not offensive, just a good discussion and information as far as I'm concerned.
I work in emissions certification for Stellantis. Trust me, an aftermarket cam and long tube headers can absolutely make you fail some of the emissions testing. That's why they mark those parts as offroad only. Even my long tubes with cats on them have "offroad only" on them.
If there was going to be any legal trouble on here, it would have happened long ago. There is constant talk of modding vehicles beyond what would be "legal". Most car forums would be shut down if that was the case. LS1Tech has been around forever, has way more talk about that kind of stuff and there are no issues. The govt doesn't monitor forums to see who's making "illegal" mods to their vehicles.