I've bought four different ones through the years. The first three had CARB #'s on the header under its logo. But the third one I bought (4-1 style) had just the logo but no #. It was brand new and came with a CARB # sticker that I put on the radiator support. People say they're crap headers but its the only CA legal option besides trying to sneak a JDM Type R header or something.
Probably just pre- and post-cert versions of the same product. K&N does the same thing, and later the CARB exempt part supersedes the old one. If the designs haven't changed, a lot of times you can get a sticker to tack on to the old version.
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