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probably won't see much unless you swap the exhaust. maybe 1-2 mpg more and about 3hp I would imagine. The filter does let the engine breathe slightly easier. I replaced my airbox with a filter on my eclipse and it did about that. (140 hp at the crank stock).
You won't notice a difference unless you drive the same way before and after. It doesn't make that much of a difference unless it's paired with other "breathe easy mods"
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