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Headers will be way more significant than a throttle body that's for sure. If you haven't done any suspension work yet, I would consider that. Putting power to the ground more efficiently is equally as significant as making more power up until the point where the suspension cannot handle it of course. We're in California as well, so if you're local to us, maybe we can help out! Let me know
Definitely do headers. You will see the most gains there, just make sure you update your tune.TB's primarily just amplify the mods that you currently have rather than offer any substantial gains of its own.