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It was be louder but when you in a high gear its not that bad, if you turn your radio on you dont even hear it! But Your mpg will go down because the map will till your computer to use more fuel and air! I know on my cobb access port there is a map for economy, which uses lower boost and advances time so you use less gas! Also they have a mode where you can set it so that it uses low boost and it stops at a certain rpm, so if you take it some where to get fixed they won't take it out and beat the crap out of your car
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