A brand new cat should sneak you through. I would definately take off everything and put it back 100% stock then add the parts back piece by piece keeping an eye on the mileage and if you lose tq in city driving. A tb that is too big causes slight stumbles you may not notice but your computer goes rich/lean extra times and that hurts economy/emissions. I'm in so cal too and want a vx powered honda, so im watching your story on here.
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