Yeah, old post.. But just because it has headers long or short tube doesn't mean it will fail unless there are other modifications down stream that cause it to fail.. I lived in California and they are very strict but it can be done, you just can't half ass it and throw a set of cheap headers on it and hope to pass. They have to be CARB compliant. Too many of these guys think that cats cause a big loss in horse power which was true when were first required, but now even the factory cats are pretty good. Just look at the Corvettes, Mustangs and Hellcats making over 600HP, 700HP and 800HP through the factory cats..