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I have a 2008 GMC Sierra Denali with the 6.2L and have some holiday money to buy a performance part for my vehicle.I am stuck between a K&N cold air intake, Diablo predator, or possible exhaust but may be out of price range. I am looking for whatever would give me the best performance increase. Improvement in gas mileage would be nice but is not that important. I have looked into changing the ecm through Wait 4 me tune but that whole deal makes me nervous because i am not overly mechanically inclined. I am leaning towards The diablo predator because i can change the top speed and from what I read on their website take off the tm. Please anyone with advice please give it ASAP because this money is burning a whole in my pocket.

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