Hedman headers have a CARB E.O #??

Ok so I was thinking about getting a set of headers for the 89. And noticed that hedmans are 50 state legal. Even says it on the th pdf straight from the carb site. I'm just wondering how these are legal considering that I have pre cats. Anyway take a look and judge for yourself

http://ift.tt/2b2qkr2

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Hedman headers have a CARB E.O #??