You guys DO realize defeating those is a $10,000 federal fine right? I realize likelihood of getting caught is nominal, but it DOES happen. Better to gut the case, then still looks officially there, here in Texas if a black and white stops you sometimes they inspect under car. If case not there guess what happens. I know firsthand of a Chevy dealer where the boys in mechanics shop were doing it. Car caught on roadside, the trooper pressed driver hard and guy told him of the dealership. When state raided and found 6 torched off converter cases behind in dumpster, entire dealership was closed down and people went to jail. Dealer/owner was fined 6X$10,000, fired everybody near the incident.