I own an auto repair and muffler shop just south of Salt Lake and cat theft is booming here. I'm doing anywhere from 2 to 5 cat replacements a week. It's not the tweekers that are doing it. These guys are professional gangs targeting specific areas every night according to a detective that reached out to me. Also some cats are worth over 1000k in scrap. Toyota and newer Ford gas engines are the 2 that are the most sought after.