Earlier quoted context omitted.
> Then why wasn't it a problem before? It is. Thousands of people have died because of aftermarket headlights. Harder to assess, but probably much larger, is the number of excess deaths from nitrous oxide etc. emitted by modified cars.
There are about 3000 deaths per year in Sweden attributed to position from cars, and 300 physical accidents. So it is a really big issue, but it is almost impossible to make people understand that their car use and modification mains people. Modified cars can release 1000x more polution, on streets with 800 daily cars that will have an affect.
This isn't complicated FFS.
The difficulty against this in the US is the unfortunate reality that the people coming to these shops to enable their stupid trucks to roll coal are the people who should technically be raiding and shutting down these companies. This can be fixed.
Physically, you can already modify your car to be controlled by a stupid program and that has been possible since at least the 90s. You can do the supposed harm by not being aware of damage to your exhaust system.
The solution to exhaust harms of ICE engines is electric cars, not a reduction in consumer rights.