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No worth the time if you want to make it sound like you have an intake! I think it helps a lil with air flow as well... MOSTLY for sound.. I did it on my 2000 when I had it
I would take it out, I did before I got my CAI. It gives you something to do and its not going to hurt your trucks performance. Its only going to help it if anything at all.
I don't see why not... I know CA has strong Emissions ****, but you should be fine... Doubt it'll change any of your emission levels other than sound, but that's not emission lol