Currently there is a fight between the EPA and SEMA, NHRA, SCCA, and others over the regulation of "off-highway" vehicles (a.k.a race cars).
That is, if you buy a new 2019 Mustang GT500, never register it and only drive it on a race track, then it should not have to meet any kind emissions control standards. Therefore all emissions controls can be removed.
Lots automotive performance parts are sold as "off-highway" use only.
While others are sold as "50-state legal."
Many automotive performance enthusiasts get away with using the off-highway parts because their state or county doesn't require emissions testing. Although it is technically still illegal to remove any emissions control device, in most cases nobody is looking.
Did all those diesel tuners selling the DPF delete kits advertise their parts as for "off-highway use only." If so, then that should be enough to cover thier butts.
On the other hand, its no secret that people are installing these parts on their trucks and driving them on state and federal highways. And the fact that many of them are "rolling coal" makes it plainly obvious. And then the stickers on the back window. And... you get the picture.
You'd think that with the current administration trying ease up on EPA requirements for new cars, making new cars cheaper to build and more affordable, thereby increasing profits for the auto manufacurers...
You'd think that with the current administration trying to fight California over its uniquire pollution control requirements...
You'd think that with the current administration lowering standards for air and water pollution from industries...
You'd think that that the loud roar of a performance engine, visibly spewing dark clouds of freedom, would be a symbol of what makes America great!
I just dont get it