The federal Clean Air Act [203 (a) (3) (A) and (B)] does
not allow anyone to replace a catalytic converter with
“replacement pipes”. Improper removal or installation of
a catalytic converter by any individual could result in stiff
fines and/or imprisonment.
The only time when removal of a catalytic converter is
allowed is when the vehicle is being shipped to a country
that does not sell unleaded gasoline. The vehicle owner
must have a letter from the EPA authorizing the catalytic
converter’s removal. Vehicles sent to Canada or Mexico
are not eligible for this exemption.