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I agree with jpsuperman. The axle back exhaust really makes no difference in horsepower over stock. The complaint some have with the stock mufflers is that they are too conservative. But that is personal preference. They are not restrictive. A manufacturer, possibly Borla, posted only a 3 hp gain switching the stock mufflers.
If you want to save some money you could do the headers and keep the stock mufflers. There is a video posted here and the sound is very deep. It changes completely. Just a suggestion.
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