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I have used Hypertech on three different cars. Their programmers are very easy to use if you follow the directions. If you have the auto trans you can change shift points and firmness. If you have already installed a CAI, this will help and you will notice a difference. If you are not sure which one to get, talk to the tech people at each company and see how they treat you, then decide. If this is your first one I would recomend Hypertech.
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