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I've got both 4.10 gears and headers. The gears are definitely the way to go. Much more noticeable difference, because of the torque.
The big win with headers is the additional noise you get along with power, lots more growl and pops. The headache with headers is definitely smog issues. Although if you can pull off the relocate (or just buy euro section 1), you should be able to pass smog no problem. No tune necessary with the relocate or euro section 1.
BTW, I think the reason most people go with headers is that you can easily find a used set and then DIY install.
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