You will get your ass slamed by CARB, becuase no header has an EO for a protege...with or without cats...sorry dude, you will probably pass an LEV emissions sniffer with flying colors with just the secondary cat, but when that monkey sticks his face in the engine bay he will see a nice shiny header without an EO number and tell you to sit and rotate...CARB kicks ass...
also from a latter post, the stock catalysts are actually pretty free flowing, the problem is the stock down-pipe...If you have to stay CARB legal, go with just a custom mandrel bent dowpipe, you will still see almost 7whp...and you will still have both cats, and no CARB Tech will see it...