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So far I have a 2 mpg increase on my best tank avarage. And this is in really cold weather compared when I got that. In comparison to the past couple months I have been getting like 40-44 and now I'm getting 49-54. This is definetly a great cold weather mod and te headers have helped out a whole lot too. I'm not sure which mod is more useful but if I had to choose between the hai and headers I'd pick the headers.
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