I know that fed law would not let you remove them.It used to be up to a 10K fine and 6 months in jail.Feds were heavy into prosecution years ago.The shops that I worked at would not touch a system if the convertor wasnt there.The feds back in the 80s and 90s actually sent people out to see if shops would eliminate them.They used to sell what was called a "Test Pipe".It was supposed to replace the convertor to see if it was clogged.Everyone knew they were just used to eliminate them.You dont want to know how many of my trucks didnt have a convertor.But I did mine myself.Rocky