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Doug- From what I understand, if you put a chip into your '07 it may void the warranty. The dealers know if you have chipped it because it resets all the computer stuff! Up here in Omaha, they won't work on a chipped vehicle from what I understand! Have a nephew that has chipped his Chevy but it has over 150,000 on it so the warranty was gone anyway! He says he definately has more power but it doesn't save him on the mpg since it opens up the fuel more. When he hits the peddle the black smoke just rolls. He has also put on propane injection on his and he says that does help with both power and mpg.
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