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not sold on the HP gain, but definatly affected mileage, put one in my girlfriends 2002 civic, increased the mileage by about 2 miles per gallon. I figured if I replace the filter every 12-15K at $12 a time, it will pay for itself in 4 changes???? add on the additional mpg, and it is a good idea. as far as pep, it sounds a little cooler, not too much difference.
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