Catalytic converters

I'm getting old, but IIRC, Honda was the first production car with cats sold in California. American manufacturers said they wouldn't work. Those were my early wrenching years, but I clearly remember working on exhaust systems back then. If the car was 1975 or newer, muffler shops wouldn't touch your car if you removed your cats for headers and duals. Now we have thieves crawling under our cars at night with a sawzall to cut them off to sell to recyclers. I'm sorry about the rant, I guess I'm getting a bit grumpy as I approach my golden years. My 70 Swinger 340 is getting TTI's, 3" pipes, and chrome tips.