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I have an early 2006 D/A with the 6 speed and the LLY lower horsepower engine,. I also added the Banks dual exhaust and Banks intake. I don't think they make any difference until I pull on hills. Then the reduction in backpressure is helpfull in keeping the exhaust temp down. Chevrolet builds a great truck. So my changes may do no more than make me feel good, but none can be used as a reason not to warranty the motor. The rest of the truck is out of warranty anyway. I really like this website as I have learned more from here then anywhere else. I also really like the people here. Thanks for all the great help and info.
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