Catalytic converters (cats) have been a legal requirement on passenger vehicles with internal combustion engines since the U.S. government passed the Clean Air Act of 1970. That means that if you ...

Introduced in 1974 by General Motors, catalytic converters were a byproduct of the 1970 Clean Air Act, which aimed at improving air quality in the U.S. by curbing smog emissions that were choking U.S.

Thanks to the Clean Air Act of 1970, all cars sold in the US after 1975 must have catalytic converters (cats) installed on them. That means that if you drive a relatively modern car, it should have ...