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performance tune


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ihave an03 sierra 2500 hd with a 6 liter that has avery restricted performance level thats why i am looking for a performance tune and would like any input you may have.such as what is the down side of acustom tune put on a predator? also what are the risks of a dyno tune done by someone that may not have a lot of experience with trucks compared to a custom tune by one of the more popular tuners ?

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