[petsfed]

When my cat was stolen, I was living in California, where only state-certified exhausts will pass emissions testing. And to date, the state has only certified OEM exhausts for Priuses.

So in my case, it was especially egregious (seriously, people have been petitioning Toyota for decades to recall Priuses to make the cat harder to steal), but in general, if you’ve got the OK to sell exhausts in California, you’re not going to endanger it by coming anywhere close to an illegal platinum/palladium fencing operation.