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Airaid Throtle Body Spacers work well, $80-120 depending on your truck, also airaid or k&n intake kits, $250+. If you have not put a free flow exhaust, I would do that first. I sell and have installed the Magna flow cat-back kits, they are easy to install and don't take much time, for me averaged about an hour. Chips or programers work well also, but have to run higher octane fuel. The first three will help the most with out spending $1000+.
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