You tree huggers are a bit much! If the gentleman wants to remove his cat converter, so be it. It's not your decision to make, and the extra emissions is like a fart in a whirlwind. I'll guarantee my leaf blower emits more crap than a Volvo without a cat converter. If you're worried about cars without cat conv's, why don't you go pick on the street rods? In virtually every state in the union you can buy or build a brand new kit car that looks vaguely like a 30's or 40's vehicle and get it titled and licensed as whatever it replicates. No emissions accessories or testing is ever required!