I think we're going to see a nationwide crackdown on emission related parts. The feds will get wise to gutted cats too. I think more and more states are going to implement smog tests for diesels too. If your vehicle came from the factory with a cat and it's not on there now, the fine is BIG! I've heard $10,000. Don't know if that's for real, but even if it's $1000, I don't think it's worth it. JMTC