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If you want to make a new intake then get some books on intake design, but if you do the math in them for the perfect intake size you will most likely end up with something about the same size as what you have now, going larger will hurt your mileage, getting rid of the chamber that is under the air filter in the bumper will also hurt your mileage and make your car louder, warmer air will help your mileage colder air will hurt your mileage.
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