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It depends (you saw this coming right?).
If all you do is change the OEM headers for some longtubes, you'll see a slight increase in HP, if you add a custom tune you'll see even more. Add to the before mentioned a custom and less restrictive exhaust from the headers on back and another custom tune and you'll get even more from your car. Then add a good CAI to it all and you'll have one fine breather going on there.
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